This controls the rear limit cam with as a cable connects it to the knob, fits size A, B, or C, it is black.

We sell over 100 different used parts. If you want to figure out what is wrong with your chair, and how to fix it, buy our twenty minute diagnosis via email, text, video or call for $20.00, purchase at this link, https://www.ebay.com/itm/255193158645

If you are in Florida we might be able to come to your location and repair your chair for you, if you are interested please ask us for a quote, so we can let you know how much it will cost.

Please let us know if you have any questions.

It is new.

This is for one sector gear with mounting hole and is a genuine OEM piece for the Aeron office furniture line by Herman Miller.

If you want multiple parts we can combine shipping. We sell these for $7 plus $6 for shipping within the continental United States at our store, www.chairbits.com under the Products Menu. Thank you for your time.