This lock is the highest security Kryptonite U-lock available, featuring a 16mm hardened MAX-Performance steel shackle with double deadbolt design. 16mm hardened max-performance steel shackle Hardened double deadbolt locking for extensive holding power Patented STEEL SLEEVE over cross bar for double security Highest security disc-style cylinder is pick and drill resistant Includes three stainless steel keys - two standard "I" keys and one LED lighted key Key Safe Program Cable Included: No Shackle Width: 4.0 Advertised Weight: 4.55 Length: 10.25 Lock Style: Keyed