The kryptonite keeper 785 integrated chain lock is crafted from heat treated boron manganese steel which offers strong and durable holding power against attacks this chain lock features a nylon webbing sleeve designed to protect your bike from scratches and the disc style cylinder is pick and drill resistant the kryptonite keeper 785 integrated chain lock has been created using the latest technologies from kryptonite and offers a high level of security against attacks kryptonite keeper