Using your Hiplok E - DX Black Chain Lock is easy. First, decide where you want to lock your bike. Wrap the chain around a sturdy object like a bike rack or a pole. Then, use the D - lock to connect the ends of the chain. Make sure the lock is properly engaged and the double dead - lock feature is activated for extra security. When you're done, use one of the 3 coded replaceable keys to unlock it. Here are some important notes. Keep your keys in a safe place. Avoid exposing the lock to extreme temperatures and harsh chemicals as this could damage the steel. Regularly check the lock and chain for any signs of wear and tear. If you notice any issues, contact our support team as the lock comes with a lifetime warranty.