The OnGuard Bull Mastiff Round Key Padlock delivers uncompromising strength and reliability in a compact, easy-to-use design. Built with a 10 mm hardened steel shackle and precision rotary locking mechanism, this padlock provides maximum resistance to cutting, prying, and leverage attacks. Its rotary-style operation allows one-hand twist-to-lock convenience, ideal for quick and secure fastening. The tight shackle clearance prevents tampering, while the weather-resistant metal housing ensures long-term durability against the elements. Supplied with five heavy-duty F-style keys, the Bull Mastiff is a professional-grade security solution for gates, chains, lockers, and heavy equipment. Heavy-Duty Security: 10 mm hardened steel shackle resists cutting, sawing, and prying for reliable protection. Rotary Lock Mechanism: One-hand twist-to-lock design for fast, convenient operation. Anti-Pry Construction: Tight clearance between shackle and body deters leverage and tampering. Weather Resistant: Durable housing designed to withstand harsh outdoor environments. Includes 5 F-Style Keys: Comes with five precision-cut heavy-duty keys for long-lasting use.