Product details:

Product Description. These Post Guide-Ons allow 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. Features: Mounting hardware included. Adjusts out to 19" each side. Fits frames up to 3" W x 5-1/4" H. 1-1/2" square, 16 gauge pre-galvanized steel uprights. 2-3/8" diameter white PVC posts.