Abus 277 Disc Lock The Abus 277 Disc Lock offers robust Level 7 security, designed to provide peace of mind for your bike or valuables. Featuring a 10mm push-to-close bolt constructed from specially tempered hardened steel, it provides strong resistance against tampering and cutting. The user-friendly Z key is highly pick-resistant and replaceable for added convenience. Features: Z key is user friendly and highly pick resistant Key replaceable Lock constructed from specially temper hardened steel 277 - Level 7 security 10mm 'push to close' bolt