Rockskis are true rocker panel protection, not just covers. They are made of steel that protects from under the door down to and around that vulnerable lip at the bottom of the rocker panel, then up the backside, with virtually no loss of ground clearance. The channel that captures the lip takes 150 tons of pressure to form. They are easily installed on all 66-77 Broncos with or without cut fenders, and come complete with stainless steel fasteners and easy to follow directions. Each ski measures 49 inches.