Kryptonite Kryptolok Series 2 LS Bicycle U-Lock with with FlexFrame Bracket (4-Inch x 11.5-inch) 13mm hardenedPERFORMANCE STEEL SHACKLEresists cutting and leverage attacks Reinforced hardenedCROSS BAR DESIGNprovides increased protection HIGH SECURITY DISC-STYLE CYLINDER ANTI-RATTLE BUMPERSreduce noise during transport ROTATING DUSTCOVERprotects cylinder IncludesNEW TRANSIT FLEXFRAME-Utransportation system which allows for versatile carrying Protective vinyl coating 2 STAINLESS STEEL KEYS Key Safe Program Product dimensions: 4 x 11.5 (10.2cm x 29.2cm) 13mm hardened Performance steel shackle resists cutting and leverage attacks Reinforced hardened cross bar design provides increased protection High security, disc-style cylinder Anti-rattle bumpers reduce noise during transport Rotating dustcover protects cylinder Includes new Transit FlexFrame-U transportation system which allows for versatile carrying Protective vinyl coating 2 stainless steel keys Key Safe Program