Guide your boat onto your trailer with proper centering in windy conditions or strong currents by using these Bunkboard-Style Boat Guide-Ons from Overton's. Covered with marine-grade carpet, these bunkboard-style boat guide-ons cradle your boat, protecting it from scratches and dings. Mounting tubes are pre-galvanized steel. Mounting hardware is included with the Overton's boat guide-ons. Fit up to 4-1/4" trailer frame. Mount 19" above trailer frame with side adjustment out to 11". Vertical supports should be placed 3' to 4' apart to allow clearance for fender and to allow support for the bunkboards. Sold in pairs. Trailer is not included.