Master Lock 3KALHRED Safety Lockout Keyed-Alike Padlock 1-9/16-inch Body with 2-inch Extra Length Shackle, Red Bumper Hardened steel shackle for extra resistance Ideal when locks may be subjected to physical abuse 1-9/16-inch (4cm) wide lock body 2-inch (5.1cm) high clearance No. 3 reinforced laminated steel padlock with red bumper Proprietary rust proofing for longer life