This Aluminum Fender Step Pad is designed for use with a Square Trailer Fender with a Straight Vertical Side. If you have a Round Fender, you would need a similar product, but one that has an angled side to match the curvature of a Round Fender. The Aluminum Trailer Fender Step is 15" long, 4" wide, and 2" in Height. It features a textured finish on top for added grip and stability when used as a step. Typically a trailer would have 2 of these mounting brackets per Fender, and 4 total. This listing is for the Boat Trailer Fender Step Pad only. There are no Pre-Drilled Holes on this Bracket, so you can easily install this to your Aluminum I Beam Trailer and its Fenders wherever needed. You can choose to either bolt these directly through your I Beam or C Channel, or if your trailer has a full square tubing frame, you can drill holes in the Bracket to allow for a U Bolt installation over your Trailer Frame instead.