Handles complement the Griffwerk product range. As the word "handle piece" already suggests, this is exclusively the handle without the rosette.
You need a handle piece if you want to put together your own protective fitting for your flat entrance door. For your individual protective fitting, combine the handle piece with a combination interior rosette set for the inside of the door and a combination protective fitting for the outside of the door. The advantage of your self-assembled protective fitting: You can individually adapt the fitting on your entrance door to your door handles on your room doors.