Allows you to see the location of your trailer when it's under water. The 2" PVC tubes make it easy to see your trailer's position when backing down the ramp. Mounting hardware included. Sold in pairs. Adjusts out to 13" each Side Fits Frames up to 3" W x 4-1/4" HMade in the USAFor larger trailer frames check out our Large Frame U-Bolt Kit (11416).Pre-galvanized steel parts are stamped from a sheet of steel after it has already been galvanized. The galvanized coating is very thin (0.45 oz. on each side).Check with your state Department of Transportation for restrictions regarding maximum trailer width.