The adapters fix to the bottom of your van ramp to minimize slope and ease entry. They are made with heavy duty but, light weight aluminum construction. they are easy to transport set up and maneuver. Reduces ramp slope and eases entry. Lightweight durable aluminum. Anti-slip, high traction surface. Easy to handle and set up. Heavy duty welded aluminum construction, will not rust. Fits easily on bottom of van ramp. Size: 24"" L x 26-3/4"" W.