Windoor Signature thumb turn with square drive. Color: Black. Standard option for Windoor 8000 and 8100 series doors. Optional option for the 6000 series. Windoor part: HDLONG-2180A
If your thumbturn has the flat drive tail piece, you will also need to replace your mortise lock with the square drive 16-800.
***Special order, non-returnable. Allow 3 to 4 week to ship.
