Protective weather cover prevents freezing. Large internal cavity and removable key hook. Push button. Alpha and numeric. 4,096 possible combinations. Durable metal construction. Holds up to 5 keys. Molded bumper and vinyl coated shackle prevent scratches on the door. 1 5/6"H x 1 13/.32"W shackle clearance. Size: 4 5/8" x 3 1/8" x 2 1/16"D. Grey.