4.22′ 10mm (0.39″) hexagonal link chain length saves weight yet clever cinch-loop design adds locking versatility. Short shackle Boxer U-lock with X4P Quattro Bolt locking mechanism eliminates pry points for superior protection. Boxer U-lock can also be used alone as a disc lock. Mastiff series chain locks provide superior protection for medium/high crime areas and are packed with features.