OnGuard Brute Series U-Locks features 16mm massive hardened ultra steel shackle which is the biggest and toughest shackle. Includes five laser cut keys and one light key and all tube multi-position quick release bracket. Five star plus motorcycle security level rating makes OnGuard Brute Series U-Locks the ultimate theft resistant locks for high crime areas. Massive 16.8mm ultra hardened steel shackle provides maximum cut resistance. Features: -16.8mm massive ultra hardened steel shackle provides maximum cut resistance -Unique OnGuard cylinder offers optimum resistance against physical attack and picking -Reinforced sleeve over crossbar and cylinder for additional security -Triple layer steel crossbar -Quattro bolt locking mechanism with dual lockdown protection pins the steel shackle at both ends creating a double lock that can withstand up to 8 tons of pull force while the M-Cylinder provides an added level of security and ease of use -Rotating dust cover protects cylinder -Double rubber coating on crossbar -Anti theft protection plan -Specifications: 16.8mm U-Lock 4.4" x 10.2"
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