Material: chrome plated aluminum, stainless steel script plate Size: 3/8" inside diameter opening; 1 23/32" outside diameter, knob head; 1 13/16" tall Application: Kenworth, Peterbilt, Freightliner, Western star, Volvo, Mack, International IHC (will not fit Volvo-pin hole too small) Location: dash air brake knob Style: blue jewel, block lettering Installation: remove roller pin in the old knob, line up holes and insert that OEM roller pin, center script plate on knob, peel sticky back paper and places script plate on the knob pressing firmly all around the knob to ensure contact with the knob Color: blue, silver Quantity: set of two-1 tractor, 1 trailer Bulk Packaging New