This is a new knob for some GM Delco navigation radios from @2006-2013. It can be used for either the Volume or the Tune. It is not for any other part or for any other radio. Just the knob. It is black in color, with a chrome ring. (The main pictures also show a dime. That is just for size reference. You are not getting a dime too...) This is brand new and has never been in a vehicle. We took them from new radios we disassembled for parts. This knob is ONLY for the Delco (Delphi) nav radios that started appearing in 2006. So your radio must look like the radio photo we've included AND be made by Delco/Delphi, not Denso. The majority of the GM nav radios were made by Delco/Delphi. However, there is another version of this nav radio that looks identical but is made by Denso. (The non-compatible Denso version is especially common in the Chevy Avalanche.) These knobs do NOT work on the Denso units! Having to return something is a pain, so it would be in your best interest to check before ordering if you want to make sure. They looked identical from the face. (GM required that of their multiple radio suppliers.) Do NOT purchase on appearance alone! Please do not purchase from this listing and ask for something different. We cannot accommodate substitution requests.