I HAVE FIVE "RCA"type knobs. these are 1 1/2 inch at theskirt, knob proper about 1 7/16. 7/8 in high.a whight lie to a pointer. Similar to knobs on the scott SLRM or some versions of rca AR-xx series. The five for $23.00 shipped to lower 48. reply direct.. jack jackiv at juno.com