Bicycle security for moderate to high crime areas with an extra long shackle14 mm hardened kryptonium steel shacklepatented double deadbolt locking mechanism for extensive holding powerhigh security ovalised cylinder that makes this a sold secure gold lockreinforced sleeve over crossbar and cylinder provides enhanced security protectionreinforced internal housing increases twisting leverage type attacksoffset key location and overhead cam locking mechanism resists leverage attacksdouble deadbolt