CE Smith Trailer Bunk Board Guide-On, 2'- Replacement Parts and Accessories for Your Ski Boat, Fishing Boat or Sailboat Trailer 1-1/2" square pre-galvanized uprights, angled out at 75 Degree 2'' x 4'' x 24" boards tilt to hug the hull and are covered with high grade marine carpet; boards are untreated Southern yellow pine Height of 21'' with adjustment out to 13" from frame on each side Can be mounted on top of frame for extra height Complete with mounting hardware to fit frames up to 3'' wide x 4-1/4'' high