Master Lock 1-3/4" W. Universal Pin Keyed Padlock with 2-1/2" Shackle is designed for use with Master Lock's universal pin keying system, ing reliable security with a laminated case and a 4-pin tumbler mechanism. The padlock features dual steel levers that lock both sides of the case-hardened shackle, enhancing protection against forced entry. Its 4-pin tumbler cylinders help prevent picking, ensuring your belongings stay secure. This system uses a mounted fixture or punch tool to shear serrated pins, allowing the padlock to be matched to a customer's existing padlock key. Please note that keys are not included with the padlock. The universal pin system is compatible only with Master Lock's key blank or the M1 blank, and a universal punch tool is required to customize the padlock to the consumer's key. Model Number: 1UPLJ