For a low-key, stealth look, the Weather Guard 121-52-04 comes in a textured matte black ARMOR TUF finish that kills glare and hides fingerprints, dust and light scratches. It is the finish to choose if you want your gear locked down without drawing attention. It is the pick for anyone who wants a tactical, low-shine look that hides marks and still wipes clean fast. The flat, non-reflective surface also cuts down on the sun glare that bounces off a bright bed. This full-size, low-profile aluminum saddle box straddles the top bed rails behind the cab and keeps a lower lid line for better rear visibility, with 11.0ft³ of secured, weather-sealed storage. A five-piece welded aluminum diamond-plate body with a reinforced C-channel front keeps it strong yet light, and a full-perimeter D-shaped weather seal locks out rain and dust.
What's Included:
121 Series full-size low-profile aluminum crossover (saddle) tool box in matte black
1Key UltraLock push-button locks, keyed alike
Under-rail mounting clamps and hardware for a no-drill install
Welded Aluminum Diamond-Plate Build A five-piece welded aluminum diamond-plate body with a reinforced C-channel front panel keeps this box strong yet light. It resists jobsite abuse and road salt without adding the weight of a steel box. This one is finished in textured matte black ARMOR TUF powder coat.
Textured Matte Black ARMOR TUF Finish A textured matte black ARMOR TUF powder coat gives a low-glare, blacked-out look that hides fingerprints, dust and light scratches better than a glossy coat. It is the stealth choice for a clean, understated truck.
1Key UltraLock Security Tamper-resistant push-button locks sit recessed when locked, giving a quick visual cue your gear is secured. The 1Key UltraLock system lets you code multiple boxes on a truck, or a whole fleet, to a single key.
Full-Perimeter Weather Seal A memory-resistant D-shaped, multi-ridge weather strip runs the entire lid perimeter to keep rain, dust and debris off your tools, so your gear stays dry and ready in any weather.
Reinforced Lid With Gas Struts Gas struts hold the reinforced lid open near 90 degrees for easy one-handed access, and welded strut shields protect them from damage. The steel-reinforced lid resists flex and stands up to daily use.
Saddle Fit Across The Bed The box straddles the top bed rails behind the cab, keeping your bed floor open for sheet goods and cargo. Enhanced tie-down buckles and 12V PowerSync-ready access round out a box built for working trucks.
Reinforced Body, Automotive-Grade Hardware Weather Guard specifies a five-piece welded body for the 121-52-04, with a C-channel reinforced front panel and a heavy-duty C-channel reinforced lid, so the box stays square when it is loaded and when someone stands on the lid. The latch is an automotive dual-stage rotary mechanism, the same style a truck door uses, so it pulls the lid down onto the seal instead of relying on a friction catch. A welded gas strut shield keeps loose tools from knocking the strut mount out of line. The D-shaped ribbed weather strip is memory resistant, so it springs back after years of closing rather than taking a set and letting water track in.
Fit guidance: Crossover, or saddle, boxes mount across the truck bed on top of the two bed rails just behind the cab, so the box straddles the bed and leaves the bed floor open. At about 72" wide this size fits standard-width full-size pickups, and because it sits on the rails rather than the bed floor it works with short, standard and long beds on those trucks. Always measure your bed rail width and check clearance behind the cab before ordering. It is not designed for compact or mid-size trucks.
Type: Saddle mount across the top bed rails, clamp-in with no drilling · Time: About 20 to 30 minutes · Tools: Socket or wrench set and a tape measure; no drill needed with the included under-rail clamps · Difficulty: Easy, best done with two people for the lift
Set the box across the two bed rails behind the cab and center it left to right. Hook the included clamps under each bed rail and tighten the hardware evenly so the box sits flat and the lid seals all the way around. Because the box is wide, have a second person help lift and hold it while you clamp it down. Follow the Weather Guard installation instructions for exact clamp placement and torque.
Watch the installation walkthrough:
Resources
Everything you need for your Weather Guard 121 Aluminum Crossover Truck Tool Box, Full-Size Low-Profile, Matte Black, in one place.
Warranty. Limited Lifetime Warranty from Weather Guard against defects in materials and workmanship.
Free shipping. This item ships free to the lower 48 states. Because it is an oversized item, it ships by freight and typically arrives in 3 to 7 business days.
Inspect on delivery. Please inspect the packaging before signing. If you see any damage, note it on the delivery receipt and contact us right away, and we will make it right.
Returns. Unused items in their original packaging can be returned within 30 days of delivery. If an item arrives damaged, defective or wrong, return shipping is on us. See our Returns & Refunds Policy, or email support@prestigetruck.com with any question.
About Weather Guard
Weather Guard has built professional-grade truck and van storage in the USA for decades and is the storage brand tradespeople, contractors, and fleets reach for first. Its steel and aluminum tool boxes, ladder racks, and van-interior systems are engineered to survive daily jobsite abuse and keep expensive tools secure and organized.
Known for weather-tight seals, patented locking systems, and heavy-gauge construction, Weather Guard products mount cleanly on work trucks and vans and stand up to years of hard use. The lineup spans crossover, low-side, and saddle truck boxes, ladder and van racks, drawer units, and fuel and utility tanks, so an entire work vehicle can be outfitted from one brand.
Backed by a strong manufacturer warranty and US-based support, Weather Guard is the name pros trust to protect the tools their livelihood depends on.
Authorized Weather Guard dealer. Prestige Truck is an authorized dealer of Weather Guard, so every tool box, rack and storage product you buy is 100% genuine and factory-new, covered by the full Weather Guard manufacturer warranty, and backed by our own US-based support team.
Weather Guard's official hardware video zooms in on the clamp and bolt kit that secures its truck boxes to the bed rails without drilling. It is a helpful close-up companion to the full box install and shows how the mounting brackets hook under the rail lip and tighten down. Use it alongside the printed instructions that ship with the box.
How the 1Key UltraLock System Works
A step-by-step look from Weather Guard at what the 1Key UltraLock actually does: how the cylinder accepts a new code, why the red push button retracts when the box is locked, and how the latch pulls the lid down against the seal. Worth two minutes before you set the box up.
How to Code Your 1Key UltraLock Lock
Weather Guard's official walkthrough for coding the lock so this box opens with the same key as the rest of your Weather Guard boxes. Follow it once when the box arrives and you can stop carrying a separate key for every lid on the truck.
Weather Guard's official hardware video zooms in on the clamp and bolt kit that secures its truck boxes to the bed rails without drilling. It is a helpful close-up companion to the full box install and shows how the mounting brackets hook under the rail lip and tighten down. Use it alongside the printed instructions that ship with the box.
How the 1Key UltraLock System Works
A step-by-step look from Weather Guard at what the 1Key UltraLock actually does: how the cylinder accepts a new code, why the red push button retracts when the box is locked, and how the latch pulls the lid down against the seal. Worth two minutes before you set the box up.
How to Code Your 1Key UltraLock Lock
Weather Guard's official walkthrough for coding the lock so this box opens with the same key as the rest of your Weather Guard boxes. Follow it once when the box arrives and you can stop carrying a separate key for every lid on the truck.
Frequently Asked Questions
Straight answers on specs, fit and support
Will the 121-52-04 fit my truck?
It is a full-size low-profile crossover, or saddle, box that mounts across the top bed rails behind the cab, so it fits full-size pickups such as the F-150, Silverado and Sierra 1500 through 3500, Ram 1500 through 3500, Tundra and Titan. It needs about 72" of rail-to-rail width. Measure your bed rails and check clearance behind the cab first, and note it is not designed for compact or mid-size trucks.
Does it require drilling to install?
No. The box ships with under-rail clamps and hardware, so it mounts without drilling into your truck. Most installs take about 20 to 30 minutes and go easiest with two people to lift and hold the box while you clamp it down.
How secure is this Weather Guard box?
It uses the Weather Guard 1Key UltraLock system with tamper-resistant push-button locks that sit recessed when locked, so you get a quick visual cue your gear is secured. The 1Key design also lets you code multiple boxes on a truck or a whole fleet to a single key.
Will the matte black finish fade or stain in the weather?
No. The textured matte black ARMOR TUF coating is built to resist UV fading and corrosion, and the full-perimeter D-shaped weather seal keeps rain and dust out. Its low-sheen texture also helps hide water spots and road grime between washes.
Is the matte black finish good at hiding marks?
Yes. The textured matte black ARMOR TUF coating is designed to diffuse light, so fingerprints, dust and minor scuffs are far less visible than on a bright or gloss finish. It gives the box a durable, low-maintenance stealth look.
What is it made of and how big is it?
It is built from welded aluminum diamond plate with a textured matte black ARMOR TUF powder coat. The exterior measures 72"L x 20"W x 18"H with 11.0ft³ of storage, and it ships at about 81.5 lb, so it is strong yet lighter than a comparable steel box.
What our customers say
4.8 · 144 reviews
5★1174★243★22★11★0
Photos from owners
+4
C Booher
Verified
08/28/2026
Awesome!!!
Love this toolbox, compliments on it everywhere i go
Water Tech
Verified
07/30/2026
Excellent
Sturdy, closes tight and locks easily. This is the best box and worth every penny.
Jason
Verified
07/19/2026
Perfect
Perfect fit. Perfect space. Super easy to install. Very happy.
Dons
Verified
06/06/2026
Soldier box
Excellent tool box, it's not as "low profile" as I was expecting. The top lid of the box has weird water drain ports for the weather seals that feed right into the side trays inside the box which hasn't been a problem, only time I noticed it was during washing of the vehicle with pressure.
Joel
06/10/2024
Damaged
Product came damaged, otherwise no issues. Not a fan of the new locks. Feel cheap
James Dugener
Verified
04/14/2026
Good truck box
Excellent construction fit perfect, and looks nice
HomeDepotCustomer
Verified
03/08/2026
Great tool box. Shipped as advertised and arrives on...
Great tool box. Shipped as advertised and arrives on time in good condition
RJ Thomas
Verified
08/22/2025
Good, solid tool box
This is a good looking, well-built tool box with excellent latches. I have no complaints with the construction or the finish. I did not like the J-latches provided and used proper bolts through drilled holes to secure the box. The tool tray is free to move and will swap sides when rounding corners. A bungie cord stops that, at least for now.
RonM
06/23/2025
Initial Review
Product arrived damage free. Finishes were as expected. The install could be better due to the tie down thread difficulty. The include tray has 4 slots for dividers, only 3 dividers included. Tray has pads on it that facilitate it sliding back & forth while driving which is annoying & damaging.
Tom Northern Michigan
Verified
05/29/2025
Weather Guard the only truck box to buy
Thanks again TSC for letting me return the other truck tool box, I picked up my new Weather Guard cross bed tool and immediately noticed the difference in quality, overall the box is much heavier, the lid is rigid so it doesn’t flex when closing it from one side of the truck. The latches catch every time and stay latched even on the worst wash board roads. I’ve always had Weather Guard boxes but bulked at the cost and bought a cheaper one first, what a mistake. It’s true you get what you pay for.
Dr Hackenbush
11/06/2025
Third time was a charm
After 2 attempts from big box dealers, Finally WW Grainger came through with a perfect box. This box is more than expected in quality. Will last my lifetime.
Mark
Verified
12/20/2024
Wonderful product sturdy and easy to use. Keep...
Wonderful product sturdy and easy to use. Keep stools rust free safe and dry Not an easy toolbox to dent or scratch.
Drewbee
Verified
11/29/2024
Great tool box.
I bought this aluminum weather guard a little while ago. Super easy install. For how light weight it is, it is really strong. It sits on my 2016 tundra. Looks great.
HomeDepotCustomer
Verified
11/27/2024
This is a solid, well-constructed truck toolbox that should last a very long time.
Charles
Verified
11/02/2024
Very happy with this truck tool box. Seems to be...
Very happy with this truck tool box. Seems to be well constructed and very secure.
JUNIOR -SA
09/14/2024
Great feature especially the new locking mechanism
Very pleased with product and craftsmanship quality, easy install.
Local Shopper
Verified
09/16/2024
great tool box and great price
great tool box and great price
Ihook716
10/01/2025
Doesn’t latch
I recently bought this low profile box. I opted to spend the extra money and get the best quality box. Unfortunately I can’t get it to close and latch properly unless I get in the bed and put all my weight on it. I have yet to find a way to adjust this. It also came with a small dent on the front face. Please help
Syd H
Verified
07/27/2024
Tool box
Best tool box I have ever owned. A little pricey but worth every dime.
Satisfied TSC Customer
Verified
06/24/2024
Nice Box
Really nice box. I really like how this box sits on my bed. Not too big. My junk fits in there snug. I'd buy it again.
Grace Pogue
Verified
06/17/2024
Nice Truck Box
This truck box was a good price. It fit my truck well and was easy to install. Lots of room for tools, etc.
Tberry05
07/11/2024
Best tool box on the market
I bought this tool box expecting the same thin construction as the previous aluminum tool boxes that I've purchased in the past. I was pleasantly surprised that this tool box is much heavier and built very well. It may be a little more that the typical truck tool box but it is very much worth it. I am very happy with this purchase.
WILLIAM
Verified
04/16/2024
These are well built and last a long time. Just wish they were a little cheaper. Thanks,
Greg
Verified
02/17/2024
A box worth installing
Sturdy, easy to install, high quality!
Well duh huh
Verified
06/18/2026
Locks
The locks our not as good as the ones on my older box weather guard
Brad
Verified
08/31/2024
This is an excellent product. Mine however showed up...
This is an excellent product. Mine however showed up with 2 dents from a forklift, which I didn't notice until after install (evening install).
DANMAN
05/31/2026
Low pro saddle box
Had high hopes for this box and while it isn't terrible, not quite what I expected. For the price point I was expecting a box built like a tank, and this one isn't. Saw other reviewers talk about the welds and, the welds on my box are decent but not spectactular. The lid on the box is different than most, not simetrical, kind of a weird gap in the back, not astheticaly pleasing. Have to set the locks with the key on first use which was unusual. Locks seems to be okay, not the smoothest operating. Release button on driver side seems to be a little glitchy, sometimes works good and other times hesitates, passenger side works fine. The keys are HUGE also, as long as the key fob for my ram and just about as wide. Don't really see the need for the key to be that large when it only inserts in the lock about 1". Thought the box was supposed to have the easy close feature but mine still has to…
RON
Verified
01/17/2024
This is my third set of Weather guard boxes, I’d say they hold up better than others. Are they worth the money? I would say so if you’re planning on keeping them for a while.
HomeDepotCustomer
Verified
07/10/2025
Perfect tool box and great size for my truck
Perfect tool box and great size for my truck
Kevin57
11/13/2024
Poor quality for the price paid
I bought this toolbox 2 weeks ago. Have opened and closed the box maybe a dozen times. The sheet metal screws holding the latch on the lid all came loose and fell off! I would think for the amount I paid for this product , I would expect a higher level of quality. This is not the first weatherguard I have owned and have always been very satisfied with the quality. It’s sad I had to repair this box after only owning it for 2 weeks. I will add photos of my repairs . I feel this should have been done from the manufacturer, or something more than sheet metal screws.
Nate
Verified
08/22/2026
Way better than by backseat floor board!
Convenient storage
Rzr
Verified
06/09/2025
Easy to install. Fits and looks great. Built strong enough to keep everything secure. Ship
Easy to install. Fits and looks great. Built strong enough to keep everything secure. Shipping was fast and no damage.
steve
09/12/2025
Great tool box
I chose this Weatherguard tool box for the low profile and storage, it is weather tight and great, knocked off a star because the stickers were all of center on the box
HomeDepotCustomer
Verified
11/10/2024
Easy to install and top-quality manufacturing, Thicker gauge metal is superior to other br
Easy to install and top-quality manufacturing, Thicker gauge metal is superior to other brands I looked at. I considered lower quality brand to save money and so glad that I chose Weather Guard brand! It operates perfectly and we have had 4 major rain/wind storms and not a sign of moisture/dust on the interior. Locks on both sides and can unlock with just using one side, nice feature. Shipped to store and was in perfect condition, Excellent protection and palletized perfectly to avoid damages.
Garrett
Verified
08/20/2026
Waited a long time...
I have waited years before buying a quality toolbox. Difference is amazing, wish I would have spent the money a long time ago. Ended up buying two so I could have one in both work trucks.
Clrcut
Verified
08/19/2026
Best box ever
Well built box. Excellent fit
Jman
Verified
08/16/2026
Tool box
Love this tool box. Very well built
JEFF T
05/28/2026
There's a reason I buy Weather Guard
This is my third Weather Guard toolbox and I can say without a doubt they just keep getting better and better. The construction, the finish, and the locks are the best yet. But the real reason I buy Weather Guard is the phenomenal service I count on and received from Susan in customer care. I called last Thursday with a concern about the anchor points and label on my box, and today (Tuesday) I came home to this package waiting for me just as promised. She was knowledgeable, professional, pleasant and resolved my concern completely and quickly. There's a reason I buy Weather Guard - and her name is Susan. Thank you.
chas24
Verified
08/12/2026
Truck box
Truck box. Is great. Just had a little issue with it not opening from one side because the rod that worked the latch was too short. I fixed it myself and it works great now
B fuller
Verified
08/04/2026
Weatherguard
Fits well on 2500 ram truck
RW fisher
Verified
07/31/2026
Sharp toolbox , heavy duty / with nice features
Great toolbox with nice space
Jose
Verified
07/13/2026
Toolbox for work
Also, experience employees are excellent with service
Anonymous
07/14/2026
Matt Black Toolbox
My husband absolutely loves it. He loves the way it appears, locks, is sturdy, and extremely well built.
HomeDepotCustomer
Verified
07/13/2026
Love it. Will never buy a cheap toolbox again!
Scott
Verified
07/07/2026
Superb box!
Went to TC to purchase a truck box. So many models out there in the 400+ range, but this one's reputation and quality was obvious. Well built, perfect powder coating and looks awesome on my 3/4 ton truck.
Jonathan
Verified
07/07/2026
Tool box
Perfect fit, allows my 5th wheel to go over it when I turn sharply
HomeDepotCustomer
Verified
06/27/2026
One of the best truck boxes . Great locking mechanism.
Anonymous
08/13/2025
Weather Guard
Worth the extra money compared to cheaper truck boxes!!
Dko3030
03/05/2026
Quality control, new locks, Huge key...
The first box i got was hot garbage. Horrible welds, not square at all, lid not centered terrible. I returned and got another and its fine. I'm not a fan of the new locks, they dont stay recessed when they are locked like they used to. Wish i had locks the old style locks and the new key is huge. It is by far the largest key on my ring.
Aaron J
04/09/2026
Changed locking mechanism
I bought this box today, I hope it lasts as long as my last one. I bought a dual lid in 2011 and has been awesome, the locking mechanism was what drew me to the product. I'm highly disappointed that Weather Guard changed there lock system. I really hopeful that the new system performs as a deterant like the old system.
Work every day
02/11/2026
It works
Good box not great if you’re looking for old school weather guard this isn’t it but works well just miss old style and quality
Rob
12/16/2024
Weather guard truck box
Solid box with excellent latches and locks. Struts are strong. Always have problems with other top box struts getting weak. I will see if these hold up, but if they don’t, lifetime warranty! One thing i don’t like, the box lid is difficult to get patched. I have to close the lid and then push with a fair amount of pressure to get it to latch and then the other side doesn’t completely latch. Hoping the seal will lighten up over time.
RANDY
08/06/2024
Mounting
The tool box is excellent in quality and craftsmanship. It is just what I wanted. The issue that I had was with the mounting hardware though. The clips did not adequately fit the bed on my GMC
Aaron
Verified
08/21/2026
Good product
Good product. Door feels a little loose when opened all the way. Solid box