CE Smith Short Bunk-Style Carpeted Boat Trailer Guide-OnsCE Smith Short Bunk-Style Trailer Guide-Ons make loading and unloading your boat easy. These carpeted trailer guide-ons provide proper center loading even in windy or side current conditions. Bunk boards are constructed of durable untreated Southern yellow pine and are covered in high-grade marine carpet.Features: Durable carpeted bunk boards; Boards tilt to hug the hull; Can be mounted on top of frame for extra height; Comes complete with mounting hardware to fit frames up to 3" wide x 4-1/4" high; Specifications: 2" x 4" x 24" Boards tilt to hug the hull; 1-1/2" Square pre-galvanized uprights, angled out at 75; Height of 21'' with adjustment out to 13" from frame on each side; Note: For larger trailer frames, check out the CE Smith Large Frame U-Bolt KitHow to Install CE Smith Short Bunk Style Boat Guide-Ons Place U-bolts as shown for either 2" wide or 3" wide frame.; Use (1) flat u-bolt and (1) formed u-bolt with washers and nuts to loosely attach each u-shaped bracket under or on top of trailer frame.; Insert the short end of guide-on upright posts into each of the u-brackets to the desired width. Note: Do not fully tighten bolts; Make sure the upright posts are seated level in the u-brackets before completely tightening the u-bolts. Finish tightening the u-bolt connections.; Attach left and right bunk assemblies to upright posts with 3/8"-16 x 2-1/4" hex head bolts, washers and nuts. Adjust angle of bunks as desired and tighten connections to hold in place.; Insert a black plastic cap on top of each upright post.; Click to Download CE Smith Short Bunk Style Boat Guide Installation Instructions