The Master Lock Magnum No. M187BLCDHC Laminated Padlock features a 2-5/16” wide laminated steel body for maximum strength and reliability, and is surrounded by stainless steel and zinc outer components for weather resistance. The 4-pin cylinder prevents picking and the dual locking ball bearings provide maximum resistance against prying and hammering. Each padlock has a Tough-Cut octagonal boron-carbide shackle that is 50% stronger than hardened steel making it 2-times harder to cut. The shackle clearance has also been increased to allow fit for more applications. The dual ball bearing locking system allows for maximum pry resistance, and is 4-times harder to break open. The number M187 lock also features Dual-Armor construction which consists of a laminated steel core, and weather resistant components. The laminated steel core provides maximum strength for the body of the padlock. Offering the maximum in strength, weather protection, and versatility, its easy to see why Magnum is the number 1 choice of professionals. This lock is ideal for use with residential gates and fences, sheds, workshops, garages, storage lockers, tool chests and toolboxes.