• (2/pak) Control Pot and Switch knobs fits 1/4" flat "D" shaft
• 1.5" diameter Knob, has tapered & grooved grip  
• New-old-stock knob as used on 1960's to 1970's radio equipment
• CBK Supply has hundreds of parts in stock:  Local pick-up: GPS 42.279521 -85.544180 
• We prefer giving pre-purchase advice but eBay blocks your contact info until you actually place an order!