This fender back is specifically designed to fit inside a-9x32 diamond plate or smooth steel rolled fender. It comes with a 12" pre-cut radius, and it serves as a splash guard to prevent water and road debris from entering the trailer bed. Features: Pre-cut to fit perfectly inside fender Weld-on installation Designed to prevent water and road debris from entering trailer bed Constructed of 16-gauge material Specs: Application: Single Axle 9x32 Smooth Steel Rolled Fender Single Axle 9x32 Diamond Plate Steel Rolled Fender Dimensions: 12" wide x 31" long Thickness: 16-gauge steel