The Master Lock Excell Titanium Reinforced 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. This stainless steel padlock with Titanium reinforced body is a durable and solid padlock with the added security of a shrouded shackle that makes it very tough against pry/pull attacks. Supplied with 4 keys and a Lifetime Warranty against mechanical failure. Suggested uses gates, sheds, storage units, fences, containers and chains. Specification Shackle Diameter 8mm. Internal Shackle Diameter 22 x 24mm. Cylinder 4-pin tumbler.