Kryptonite Evolution Series 4 Standard Heavy Duty Bicycle U Lock Bike Lock (4-Inch x 9-Inch) 14mm hardenedMAX-PERFORMANCE STEEL SHACKLEresists bolt cutters and leverage attacks Patented*,HARDENED OVAL CROSSBARdesign is stronger than typical round tube HardenedDOUBLE DEADBOLT DESIGNgives additional protection against twist attacks HIGH SECURITY DISC-STYLE CYLINDER IncludesNEW TRANSIT FLEXFRAME-Utransportation system which allows for versatile carrying Protective vinyl coating SLIDINGDUSTCOVERprotects and extends cylinder life 3 STAINLESS STEEL KEYS one lighted with high intensityLED BULB 7 REPLACEABLE BATTERY Key Safe Program Product dimensions: 4 x 9 (10.2cm x 22.9cm) 14mm hardened MAX-Performance steel shackle resists bolt cutters and leverage attacks Patented*, hardened oval crossbar design is stronger than typical round tube Hardened double deadbolt design gives additional protection against twist attacks High security disc-style cylinder Includes new Transit FlexFrame-U transportation system which allows for versatile carrying Protective vinyl coating Sliding dustcover protects and extends cylinder life 3 stainless steel keys  one lighted with high intensity LED bulb & replaceable battery Key Safe Program