Bicycle security for moderate to high crime areassilver sold secure13 mm hardened kryptonium steel shacklepatented deadbolt locking mechanism for extensive holding powerflat key 7 disc high security pick safe disc style cylinderreinforced sleeve over crossbar and cylinder provides enhanced security protectionreinforced internal housing increases resistance to twisting and leverage type attacksoffset key location resists leverage attacks and overhead cam locking mechanism resists leverage attacks