Master Lock 1-9/16" W. Universal Pin Keyed Padlock with 1-1/2" Shackle is designed for use with Master Lock's universal pin keying system, ing a reliable and secure locking solution. It features a laminated case with a 4-pin tumbler security mechanism and dual steel levers that lock both sides of the case-hardened shackle, providing enhanced protection against tampering. The 4-pin tumbler cylinders are specifically engineered to help prevent picking, ensuring your belongings stay safe. This system uses a mounted fixture or punch tool to shear serrated pins, allowing the padlock to fit a customer's existing padlock key. Please note that the padlocks do not include keys, and the universal pin system is compatible only with Master Lock's key blank or the M1 blank. A universal punch tool is required to match the universal padlock to the consumer's key, making this padlock a versatile and secure choice for various applications. Model Number: 3UPLF