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 youll always have spares. 180cm Version Longer 610mm (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