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Bass Pro Shops Bunk Guide-Ons provide positive centering assistance when loading a boat on the ramp. Our bunk-board guide-ons have black marine-grade carpet encasing and come mounted on pivots adjusting easily to cradle the sides of the boat. Pre-galvanized 1-1/2″ square steel uprights angle out at 75o and mount onto your trailer frame with brackets and U-bolts that accommodate frames up to 4-1/4″H x 3″W. Our sturdy bunk boards ride 21″ above the frame. Mounting brackets allow up to 13″ of adjustment out from each side of the frame. Front-to-back distance between uprights is fully adjustable and set during installation to fit the trailer frame and fenders. Comes as a complete pair for both sides of the trailer. Imported.