INDUSTRY BEST Surface Mount Key Keeper - Loose key type / anodized aluminum finish To be surface mounted on the wall outside mail room for USPS access to mail room Mail room key remains loose inside key keeper Prepped to receive USPS master lock (USPS lock by USPS / is not included) Aluminum construction; (silver color) anodized aluminum finish; Box measures approx 5-1/8"H x 4-3/8"W (excludes outside trim dimension)