This RL Drake 7-Line Main Tuning Spinner Knob for TR-7, TR-7A, R7 & R7A, is BRAND NEW!NOTE: This Original tuning knob has a free turning finger divot which makes it easy to spin the tuning dial! (not like some glued on aftermarket knobs) Several years ago my company purchased much of RL Drake's Parts inventory and these knobs are original RL Drake knobs!This knob will also fit the RV-7 and RV-75 VFOs This knob is 1 3/4 inch in diameter and 5/8 inch high. This knob will fit a 1/4 inch shaft. It has a slotted set screw. This Main Tuning knob is VERY hard to find so do not let this one get away!