ONGUARD 8002 Pitbull LS U-Lock with Bracket Massive 13mm (1/2 inches) hardened ultra steel shackle provides maximum cut resistance Unique OnGuard cylinder offers optimum resistance against physical attack and picking Reinforced sleeve over double layer steel crossbar for maximum security Rotating dust cover protects shackle Double rubber coating on crossbar, includes 4 laser-cut keys and 1 micro-light key