Master Lock 2" W. Universal Pin Keyed Padlock is designed for use with Master Lock's universal pin keying system, ing reliable security with its laminated case and 4-pin tumbler mechanism. This padlock features dual steel levers that lock both sides of the case-hardened shackle, enhancing its resistance against forced entry. The 4-pin tumbler cylinders help prevent picking, ensuring your belongings stay secure. The system works by using a mounted fixture or punch tool to shear the serrated pins, allowing it to fit a customer's existing padlock key. Please note that keys are not included with the padlocks. The universal pin system is compatible only with Master Lock's key blank or the M1 blank. To match the universal padlock to a consumer's key, a universal punch tool is required. Model Number: 5UP