Loading ramp kit. Top and bottom for 2 inch x 12 inch plank. Kit makes it easy for you to assemble your own sturdy ramps to fit snugly against tailgates, loading surfaces or steps. You bolt the aluminum end pieces to your own 2 inch x 12 inch plant (not included) using the hardware supplied. Ramp bottoms have unique patented rocker for added gripping action while loading heavy cycles. Precision made in the U.S.A.