Elma 020-2220 – Round Shaft Knob, 3.175mm
The Elma 020-2220 is a black round knob (without indicator line) made of nylon (polyamide) with a glossy finish. It has a 10mm knob diameter and is designed for a 3.175mm round shaft, fixed onto the shaft using the proven collet tightening method.
Quick spec sheet: