Keyless and safer: The 4-position combo padlock has a unique keyless design that saves you the stress of carrying your keys. You don't need a key here. What you have is a 4-digit resettable combo bike lock that offers 10,000 possible combination combinations. You can easily set or reset the lock to a password of your choice, making the lock harder to crack. Bike Lock Heavy Duty Anti-Theft 15mm Hardened Zinc Alloy Shackle Resists Knife and Lever Attacks. The PVC-coated paddle lock protects the lock from any scratches. The door lock of the metal fence is good. Sturdy 4-digit combination padlock - Easily set up your own 4-digit combination with just two hands. The smooth dial rotation gives you confidence in the quality. U-shaped glass door lock size: Lock: 177 mm / 6.9" Lock length: 342 mm / 13.4 Inner Diameter: 78 mm / 3 inches Locking ring diameter: 16 mm / 0.6 in Here's how to set up a combination of bike combination locks? 1. Set the original password 0000 to unlock the lock 2. Use a small screwdriver to open the small screw on the bottom and dial from A to B 3. Turn the dial to set your own combination code 4. Set the password you need before switching from B back to A 5. Your password is set successfully Notes: Please remember the password you set. It cannot be opened after forgetting Packing list: 1 adjustable shackle lock 1 small screwdriver