These easy to see post-style Boat Guides help you load your boat safely while also providing a visual aid when backing in an empty trailer. Fits up to 3" x 4" tube or channel trailer frames. PVC guides with heavy-duty steel component parts. Galvanized for additional durability. Bright orange end caps offer an easily visible target. 16" of side adjustment for 4' x 2-3/8" PVC guide tubes. Includes all necessary mounting hardware.