Black Bakelite knob. Fluted grip. ¼” brass bushing with set screw. ¾” in diameter x 7/16” high. Fits potentiometers for Superior Panel Technology dimmers.
Knobs work great. Brass insert with slotted set screw. I ordered these twice. Skirts were 3/4 but the knob portion on one order was 5/8 and 1/2 on the last order. They both worked fine on variable resisters with a single pole switch built in. Luckily they are in different areas in the aircraft.