The OnGuard Mastiff 4&'; Key Chain Lock delivers robust, all-weather protection for commuters and riders. Its 1205 mm (47.5 in) titanium-reinforced hardened-steel square links resist cutting and twisting. The integrated X2P Dual Lock Down head secures both sides of the shackle for high strength. A double rubber cover absorbs shocks and guards paint. Includes five laser-cut keys (one with LED light). Extended security: 1205 mm (47.5 in) titanium-reinforced chain provides reliable high-theft protection. Dual Lock strength: X2P Dual Lock Down head locks both ends for maximum pry and twist resistance. Impact protection: Double rubber cover shields lock body from bumps and scrapes. Weather ready: Automatic keyway cover keeps out dust and moisture for long-lasting use. Keys included: Five laser-cut keys (one with LED light) and OnGuard&';s anti-theft program included.