Non-rusting Brite-Tread aluminum. BriteGard powder-coated finish. Lockable lift-up lid. Sturdy piano hinge. Fits under most Tonneau covers. Product Features:Non-Rusting Brite-Tread AluminumBriteGard Powder-Coated FinishLockable Lift-Up LidSturdy Piano HingeFits Under Most Tonneaus Covers