The Master Lock Magnum No M5XTLF Laminated Padlocks feature a 2 in. W (51 mm) laminated steel body for maximum strength and reliability and is surrounded by stainless steel and zinc outer components for weather resistance. The 3/8 in. Dia (10 mm) octagonal shackle is 1-1/2 in. L (38 mm) and made of Tough-Cut boron-carbide, 50% harder than hardened steel, offering maximum resistance to cutting and sawing. The 4-pin cylinder prevents picking and the dual locking ball bearings provide maximum resistance against prying and hammering. The Lifetime Guarantee provides peace of mind from a brand you can trust. Features: Tough-cut octagonal boron-carbide shackle is 50% harder than hardened steel 1-1/2 in. (38 mm) shackle clearance for more uses Dual-armor protection: 2 in. (51 mm) laminated steel core for strength surrounded by stainless steel and zinc outer components for weather resistance Reinforced body bumper for scratch resistance Keyed alike same key opens both locks