This hat bracket is an ideal replacement for your boat trailer. Made out of 1/8” thick galvanized steel, it is normally used with an Upright guide pole set. It is designed to clamp 1 1/2" x 1 1/2" square tubing to the main frame of a boat trailer. This bracket has multiple holes for various size frames (widths) and uses 3/8” diameter ubolts to attach to your boat trailers frame.