Kryponite's tough bicycle security for low to moderate crime areas and well-lit lock-up situations. 1/2" (13 mm) hardened high-grade carbon alloy steel shackle resists hand tools. 4-digit resettable combination locking mechanism, patented, high security Bent FootTM design, and center keyway defends against leverage attacks. Anti-rattle bumpers reduce noise during transport. Includes side mount, snap-in bracket.