Kryptonite Kryptolok Series-2 ATB Heavy Duty Bicycle U Lock Bike Lock with Transit FlexFrame Bracket 13mm hardenedMAX-PERFORMANCE STEEL SHACKLEresists cutting and leverage attacks Reinforced hardenedCROSS BAR DESIGNprovides increased protection HIGH SECURITY DISC-STYLE CYLINDER ANTI-RATTLEBUMPERSreduce 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: 5 x 9 (12.7cm x 22.9cm) 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