Buyers Products Diamond Tread Aluminum Underbody Truck Box w/Drawer (20x18x36 Inch) Dimensions: 20"(H) x 18"(D) x 36"(W) Built tough with durable, corrosion-resistant, .100 in. thick diamond tread aluminum for great weather resistance. Contents protected by a recessed drop door with continuous hidden hinge. Shut out weather and theft with the locking, die cast compression latch system. Can be mounted on either a flat surface or under-bed.