For sliding security and screen doors the Austral Lock SD7 Sliding Security Door Lock offers reliability, durability, and strength to keep you and your family safe and secure. This door hardware is suitable for all types of residences. The self-latching lock bolt engages automatically when the door is closed. It can be deadlocked or unlocked with a key from either side. It also has a convenient snib locking function from the inside. (The key overrides the snib). Australian designed and manufactured in Melbourne.