The Master Lock Magnum M5XTLJ Heavy Duty Stainless Steel Padlock with Key features a 2 in. (51 mm) wide 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. (10 mm) diameter octagonal shackle is 2-1/2 in. (64 mm) long 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 know and can trust. Features: Outdoor lock; Heavy duty padlock with key is best used for outdoor storage and fences, self-storage units & lockers, tools, job boxes and more Key lock features Dual Armorâ„¢ construction: laminated steel lock body surrounded by stainless steel & zinc outer components and Tough-Cutâ„¢ octagonal boron-carbide shackle is 50% harder than hardened steel 4-Pin cylinder and dual ball bearing locking for increased pick and pry resistance; Reinforced body bumper for increased scratch resistance 2 in. (51 mm) wide lock body; 3/8 in. (10 mm) diameter shackle with 2-1/2 in. (64 mm) length, 15/16 in. (24 mm) width; Extended shackle for application flexibility Includes two padlocks with two keys; Both keys open all locks