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 Armor construction: laminated steel lock body surrounded by stainless steel & zinc outer components and Tough-Cut 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. 1-3/4 in. (44 mm) wide lock body, 5/16 in. (8 mm) diameter shackle with 1 in. (25 mm) length, 13/16 in. (21 mm) width. Includes four padlock with two keys, Both keys open all locks.