1. Measure to confirm that the door is between 1-5/16''~ 2 '' (33 mm-50 mm) thick.

2. Measure to confirm that the diameter of the hole is 2 1/8'' (53 mm).

3. Measure to confirm that the backset is either 2-3/8'' or 2-3/4'' (60 mm or 70 mm).

4. Measure to confirm that the diameter of the hole in the door edge is 1'' (25 mm).

5. Measure to confirm the depth of the hole in the frame is less than 1''(25mm).