Residential screen doors locks are usually Whitco Tasman or Whitco Leichhardt, which both use this cylinder. Various other brands also use this cylinder, including many 3-point locking screen doors.
These are a double cylinder, with keyway on both sides of the door, effectively making them a deadlock.
These are simple to install providing you have the existing key for the existing cylinder. If not, send us a photo and we might be able to help.
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