For use on 2″ track only. No screech spring actuated lock bar. Zinc gold toned finished to prevent rust and corrosion. These slide locks are great security to secure a garage door from the inside. Since there is not a key entry on the door it is much more tamper resistant than keyed locks. You can add a lock on one side of the door or add one on each side for more security. It is easily installed with 2 sheet metal screws or Tec screws.