Prime Design AluRack Aluminum Roof Rack Black for 5 6 FT Pickup Topper Model AR1212 BLK 1 27 64 In polished exterior appearance when closed LocOut Option:Without LocOut polished exterior appearance when closed while delivering highly functional full bed access when open control module operation and powder coated aluminum construction truly makes these r etractable running boards an asset for the offroad truck or Jeep Full Length Side Rails: Features 5 inch high aluminum side rails to keep cargo securely on the rack during transit Integrated Rear Roller: Allows for the effortless loading and unloading of long or bulky cargo from the back of the van