Buyers Products Mounting Brackets for Polymer Truck Boxes are lightweight and corrosion-resistant. They are designed to securely hold your polymer underbody truck box. Formed from strong, C-channel A-36 steel, the angled, pre-drilled brackets are black powder-coated for an extra layer of protection from rust and the elements. They are designed for exact fit and built for long wear, keeping their shape with welded angle braces that can handle constant road vibration and impact without fail. The brackets are sold in boxed pairs.