Load your boat even in wind or side currents. Our Bunk Guide-Ons line the boat up straight and keep it that way. Bunks are made of strong injection-moulded composite material and durable, polypropylene carpeting. Two-piece design eliminates staples and makes replacing worn carpet easy. Frame is heavy-gauge, 1-1/2" square steel tubing and adjusts as far as 13" on each side. Mounting bracket adjusts to fit a trailer frame up to 2"W x 5"H bracket spacing. Per pair.