Check the listing for details. Kryptonite KryptoLok U-Lock 4 x 9" Black w/ Bracket Anti-Rattle Bumpers. Color: Black, Condition: New. Listed at 68.95 USD. The KryptoLok features a high security pick and drill resistant disc-style cylinder. High security pick and drill resistant disc-style cylinder. Patented cam resists attacks by pry bars and hammers. Includes EZ mount carrying bracket. Patented bent-foot design makes lock-up easy. Patented bent-foot design makes lock-up easy, patented cam resists attacks by pry bars and hammers. Anti-rattle bumpers keep lock chatter to a minimum. Hardened, 13mm Performance Steel shackle and reinforced hardened crossbar design gives more protection for the lock internals than ever before. Security Rating: 6 out of 10. The high security disc cylinder now includes a new anti-float feature to keep the discs from moving and readjusting when in transit. Transit Flex Frame Bracket system fits on the adjustable.