The Master Lock Excell Laminated Steel 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. The laminated steel padlocks are built for strength, with stainless steel and zinc outer components for exceptional weather resistance. They have either a precision 4-pin or 5-pin cylinder and recessed rivets that are chisel resistant. Supplied with 4 keys and a Lifetime Warranty against mechanical failure. Suggested uses: gates, sheds, storage units, fences, containers and chains.