Self-packaged, hardened special steel offers no weak points against sawing, cutting, or impact attacks, X2-Power - The "Double Bolt Locking System" features a double bolt lock and increases pull-out resistance by locking the bolt from both sides, BumpBlock M-Cylinder - the steel-encapsulated precision lock cylinder is optimally protected against drilling, pulling out, and impact attempts, robust nylon sleeve protects the frame from scratches, with 4 keys + 1 LED key Article type design chain lock diameter 10.0 mm main color black length 110.0 cm locking method key maximum security