The Firearm Trigger Lock by Allen is a heavy-duty and durable locking device that is placed over the trigger mechanism in seconds and locks securely in place. When you need your firearm, simply insert the key, turn and the lock comes open, no need to unscrew a long fastener to open it. Certified for use with most shotguns, rifles, revolvers, and pistols. Not for lever-action rifles. It comes with two keys. This is a California-approved Firearms Safety Device that meets the requirements of California Penal Code Section 12088 and the regulations issued thereunder.