The master lock excell weather 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