The Abus 275A Alarm disc lock features a 5mm steel pin and locking bolt made from specially hardened steel with a vibration-sensitive alarm with over 100dB Sound. Thanks to a push-down cylinder, it is simple to use without compromising security with signals to indicate activation status easily. The locking mechanism's bolt, body and structural parts are made of specially hardened steel. Comes with three keys—Abus security level 9.