Cliff FC1616 K1C Knob Blk / Silver 6.35mm Screw Fix

Axle mount: 6.35 mm; Factory colour: Black, Silver; Material: Plastic; Product size (height): 15.1 mm; Product size (Ø): 25.4 mm; Type (misc.): Mounting with lock screw

Price: 3.49 from Conrad Electronic