ExcellWeather Tough 45mm Padlock 4-Pin - 38mm Shackle - Master Lock M515EURDLHCC, The Master Lock ExcellWeather Tough Padlocks are made with cutting edge technology to deliver unprecedented security. They feature tough cut patented octagonal boron carbide shackles which are 50% tougher to cut than hardened steel, and dual ball bearing locking mechanisms for maximum pry resistance. Made from laminated steel with a thermoplastic cover for maximum protection against the elements. They have a Rust-Oleum® rustproof finish that guarantees the body free from rust and either a precision 4-pin or 5-pin cylinder. Supplied with 4 keys and a Lifetime Warranty against mechanical failure. Suggested uses: gates, sheds, storage units, fences, containers and chains.The Master Lock M515EURDLH has the following specifications:51mm Excelllaminated steel padlock with weather tough thermoplastic cover - 51mm Octagonal boron carbide shackle, 10mm diameter - 5-pin tumbler cylinder - dual ball bearing