These are 3 x Keyed Alike Euro Cylinder Type Door Locks for PVC / Double Glazed Doors etc. All 3 locks come with the same keys, 3 matching keys per lock and a new mounting screw. Each lock has 8'000 + different key combinations on unmatched locks. The finish is Nickel and the length is 30/30 (mm). To measure your lock, remove your old lock from the door and measure the distance as marked "A" & "B" in Millimeters. Simply select the correct dimension from our listings (short side/long side). Tip: Many locks are offset and not equal sizes. Tip: The lock should protrude through the handle by just a few millimeters.