OnGuard BullDog series u-locks feature X2P Double Bolt lock mechanisms and strong 13mm (0.51”) hardened steel shackles for a full circle of protection. Bulldog includes free 1-year, anti-theft guarantee 4.6 Tons pull strength with anti-drill and pick resistance Hardened ultra steel shackle with reinforced sleeve over crossbar and cylinder for added security 11mm hardened ultra steel shackle
