The Kryptonite New York Legend Chain Padlock bicycle lock is rated a 10 on the Kryptonite scale of security. Ten indicates that it provides ultimate security for your bike. This 90cm long chain is made from 3t hardened steel, which is resistant to bolt cutters. The chain is a thick 15mm in diameter. The padlock is 16mm of hardened MAX Performance steel with a double deadbolt design. This design makes the lock impervious to being pried open via twisting. The lock itself if a high security disc cylinder. To protect your bike against scratches, the entire length of the chain was covered with a weather resistant nylon cover. Hook and loop straps hold it in place. The Kryptonite New York Legend Chain Padlock is available in one size and one color. It comes with three keys that are replaceable if you register them through Kryptonite's Key Safe Program.