Master Lock 1-9/16" W. Universal Pin Keyed Padlock is designed for use with Master Lock's universal pin keying system, ing a reliable and secure locking solution. This padlock features a laminated case and a 4-pin tumbler security mechanism that helps prevent picking. Its dual steel levers lock both sides of the case-hardened shackle, ensuring enhanced protection. The universal pin system uses a mounted fixture or punch tool to shear the serrated pins, allowing the padlock to fit a customer’s existing padlock key. Please note that padlocks do not include keys. 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 match the padlock to the consumer’s key. Model Number: 3UP