The Master Lock Excell Stainless Steel Discus 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. Offering optimum weather resistance with the additional security of a shrouded shackle, which is much tougher to pull/pry open. They have a precision 4-pin cylinder and are supplied with a Lifetime Warranty against mechanical failure. Supplied with 4 keys and a Lifetime Warranty against mechanical failure. Suggested uses: gates, sheds, storage units, fences, containers and chains.