Built For Medium To Heavy Duty Trucks, Buyers Products Heavy Duty Diamond Tread Aluminum Step Box Provides Framed Steps With Convenient Built-In Storage Space. These Boxes Are A Great Multi-Purpose Solution For Larger Vehicles Like Class 8 Trucks. The Durable Design Incorporates A Smooth Aluminum Body With A Diamond Tread Aluminum Door For Great Stability And Looks. A Die Cast, Locking T-Latch And Single Rubber D-Bulb Door Seal Help Keep Your Tools Protected From Weather And Theft. Corner Gussets And A Continuous Hinge On The Door Opening Provide Extra Strength.