The kryptonite kryptolok series 2 d lock offers bicycle security for moderate to high crime areas with a standard length shackle constructed out of 13 mm hardened kryptonium steel shackle and using patented deadbolt locking mechanism for extensive holding power high security disc style cylinder with a reinforced sleeve over crossbar and cylinder provides enhanced security protection utilising a reinforced internal housing increases twisting leverage type attacks and a offset key location and