Abus Trigger Alpha 2.0 355 Disc Lock The Abus Trigger Alpha 2.0 355 Disc Lock is developed for Level 6 security, aiming to safeguard bikes or valuables with confidence. It uses a 5mm bolt made from specially hardened steel that resists tampering and cutting effectively. This lock is operated with a Z key, noted for its high resistance to picking and is replaceable, enhancing its convenience. Features: Abus Security Level 6 Secure locking by T-bolt: locking bolt anchors to the lock body after locking, preventing the lock from spreading Z key is user friendly and highly pick resistant Key replaceable Lock constructed from specially temper hardened steel 355 - Level 6 security - 5mm 'push to close' bolt (shackle diameter) Throat length: 40mm