Don't get caught in the gap between your trailer floor and ramp door! These heavy aluminum plates are hinged for easy use. Just mount the short side to your trailer floor. When you open the door, they flip down for use. When you close the door, they flip back up. You don't need to position them for use or take them out for storage. The plates are also contoured for an easy transition from ramp to floor. Each piece measures 36" W x 9" D. Sold in pairs (covers a total of 72" of gap).