Cliff FC1611 K1C Knob Black - 6mm Screw Fix

Cliff K1C Black Control Knobs - Cliff FC1611, A classically-styled, low-cost black plastic screw fixing knob to suit 6mm shafts. Cliff FC1611 K1C Knob Black - 6mm Screw Fix

Price: 1.88 from Rapid Online Rapid Electronics Ltd.