Master Lock hardened steel chain and padlocks provide robust security for bicycles and other valuable equipment. Designed to resist cutting, sawing and prying, they feature toughened steel links and a protective nylon sleeve to prevent scratches. The high-security locks include hardened steel shackles, anti-pick cylinders and dual locking mechanisms for maximum protection. Suitable for indoor and outdoor use, these locks are weatherproof and security-certified. Backed by a limited lifetime warranty, they deliver reliable protection and peace of mind. Features and Benefits: Hardened steel chain resists cutting and sawing Protective nylon sleeve prevents scratches and damage High-security lock with hardened steel shackle for maximum strength Anti-pick cylinder for enhanced protection against theft Dual locking mechanism resists prying and hammering Weatherproof design for indoor and outdoor use Certified security rating for added confidence Backed by a limited lifetime warranty