MasterLock 3KA3303 Keyed to 3303

Using the MasterLock 3KA3303 is easy. Just insert the key into the 4 - pin cylinder and turn it to unlock or lock. When you're using it, make sure the shackle is fully inserted and locked in place for maximum security. As for maintenance, since it has proprietary rustproofing, it can resist rust for a long time. But it's still a good idea to keep it dry. Avoid exposing it to harsh chemicals or extreme weather conditions as much as possible. If you find the lock is a bit stiff, you can use a little graphite powder to lubricate the cylinder. And don't forget, with thousands of key changes, make sure to keep your key safe to maintain the lock's key integrity.