This Electro Plated Galvanized Hat Bracket is an ideal replacement for your boat trailer. Made out of 1/8 inch thick Galvanized Steel, it is normally used with an Upright guide pole set. It is designed to clamp 1 1/2 inch x 1 1/2 inch square tubing to the main frame of a boat trailer. This bracket has multiple holes for various size frames (widths) and uses 3/8 inch diameter Boat Trailer U-Bolts to attach to your boat trailers frame. On a typical Boat trailer when using this for Guide Poles you would need two. This bracket is also common see on other CE Smith Brand Bunk Board and Roller Guides as the bracket mounting the poles to the frame. This guide pole mount is great for square tubing and c channel boat trailer frames. The inner diameter of the mount is the perfect dimension for all standard 1 1/2" Square posts. Once the U-Bolts are tightened down, this bracket will secure the posts to prevent movement.