16mm hardened MAX-Performance steel shacklePatent-pending hardened double deadbolt design gives additional protection against twist and cut attacksHighest security disc-style cylinder is pick and drill resistant Sliding dustcover to protect from dirt and debris 3 stainless steel keys- including new design and one LED replaceable key fob Includes Flexframe-U Bracket providing convenient multi-location u-lock transport Key Safe Program Protective vinyl coating Dimensions: 4INX8IN