This thing replaces the standard Schlage privacy Plymouth style knob (and probably others.) If you are a cat crazy person (like some of the people in my house) then follow these instructions to update your knobs.Printed with a raft. To remove the standard Schlage knob drill a hole in the top dimple (see picture) then punch out the swage on the opposite side. The old knob will slide off, just slide your print into place. Mine was tight so I just left it snug, if yours is loose you can add a screw where the swage was to keep the knob in position.