Peterbilt black ball shift knob vintage style with chrome stainless steel insert

2.20 inches x 2.20 inches for ball not including steel chrome plated insert. 

Thread size 1/2 13   - This is a common thread size make sure you can use this or have an adapter if you do not have a common Thread 1/2 13. We also have a nut to hold in place. 

Size: 2.25 by 2.25 inches 

Check out our air valve extenders on our other listing. You can switch out your air valves for these knobs if you have the screw on air valves.
Air Valve extender shift knob aluminum 1/2 13 thread kenworth peterbilt trucking | eBay

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