Kryptonite new york u lock flexframe bracketthe new york range of u locks are the strongest on the market and offer the highest levels of protection for your bike. The standard u lock is constructed from extra thick 16mm enhanced steel and has a double locking system for added security. It is vinyl coated to prevent scratches to your frame, features a dust cover to protect the cylinder and ensures that the lock is weather proof. Plus, it comes with a flexframe mounting bracket to hold the lock while riding.features16mm hardened steel shacklesold secure gold ratedflexframe mounting bracket3 stainless steel keys ndash one lighted with high intensity led bulb replaceable batterydimensions 10.2cm x 20.3cmweight 1.97kgbuy kryptonite accessories from chain reaction cycles, the world's largest online bike store.