PRO SERIES BLACK STEEL UNDERBODY TRUCK TOOL BOX SERIES - 1752810. The extra-thick 12 ga Powder-Coated Steel provides maximum durability. Corrosion-resistant, and built to last, the stainless steel bolt-on hinge with a 1/4" pin ensures long-lasting use and durability.Product Common Use: Flatbed Trailers, Utility Truck Bodies, Service Bodies, Dump Bodies.