Sold Secure Gold Rated The OnGuard Mastiff chain lock is tough security system for when you have to leave your bike in public. The super tough bike chain is 130cm long for easy locking around a range of objects. Titanium enforced steel chain links offer excellent resistance against sawing and cutting attacks as well as bolt cutters. The Z-Cylinder is bump proof and secure against picking, drilling and pulling style attacks. The OnGuard Mastiff bike lock also comes with 5 laser cut keys including one with an LED light, so you’ll always have spares. 180cm Version Longer 6’ 10mm (0.39”) titanium reinforced, hardened steel hexagonal link chain for more locking options. Hexagonal and square links present more hardened surfaces than round links making sawing and cutting virtually impossible. Titanium surface hardening vastly increase cut and saw resistance. Embroidered nylon chain covers wont crack or peel for long lasting beauty. Velcro tabs keep cover in place to help protect paint and finishes. Comprehensive selection of locks types, chain lengths and link size to exactly match security needs. Chain dimensions: 180cm x 10mmShackle diameter: 14mm Hardened steel Key Features: Automatic keyway cover, weatherproofs the lock mechanism10mm (0.39”) titanium reinforced, hardened steel hexagonal link chain resists cutting or pryingChain cover protects paint and finishes, embroidered logo won’t flake or wear offBump proof Z-Cylinder resistant to picking, pulling and drillingIncludes 5 laser cut keys, 1 with in built micro LED 110cm Version  Short-shackle Boxer U-lock with X4P Quattro Bolt locking mechanism paired to a 3.5-foot long, 10mm (0.39”) titanium reinforced, hardened steel hexagonal link chain. Hexagonal and square links present more hardened surfaces than round links making sawing and cutting virtually impossible. Titanium surface hardening vastly increase cut and saw resistance. Embroidered nylon chain covers wont crack or peel for long lasting beauty. Velcro tabs keep cover in place to help protect paint and finishes. Comprehensive selection of locks types, chain lengths and link size to exactly match security needs. Chain dimensions: 110cm x 10mmShackle diameter: 14mm Hardened steel Key Features: Automatic keyway cover, weatherproofs the lock mechanism10mm (0.39”) titanium reinforced, hardened steel hexagonal link chain resists cutting or pryingChain cover protects paint and finishes, embroidered logo won’t flake or wear offBump proof Z-Cylinder resistant to picking, pulling and drillingIncludes 5 laser cut keys, 1 with in built micro LED