• All effects are under the surface and smooth to the touch.
• 2-1/4" Diameter.
• For threaded dash air brake valves (threaded bendix type used from 90's through today).
• Made with a polished billet collar with the correct built in thread. 
• Includes a set screw in the collar to align the knob with logos, etc. to keep them tight.
• Sold Individually
• Quality Made Product

If you should need additional Truck Parts and Accessories that you don't currently see on our website please don't hesitate to call us at 1-405-470-8400. We are adding new items to our online inventory daily!