Durable double-walled aluminum slat construction Matte black powder coat finish Low-profile design Sealed-ball-bearing rollers provide effortless, maintenance-free operation Trax Rail System accepts most T-slot accessories from name-brand manufacturers Compact canister is minimally intrusive Key-lockable in any position 500-lb. cargo capacity (evenly distributed) Integrated drain channels and tubes keep cargo dry Functions independently of the tailgate Legendary lifetime warranty Proudly Assembled in North Dakota