Black control knob with grey insert and white index line (259-6929) by RS Components. 16.2mm diameter (at flange) x 15mm high. To fit 6mm diameter shaft. grub screw fixing. RS Stock Number: RS259-6929 (5pack) Status: NOS (New Old Stock) Please note our price is PER KNOB, no need to buy a pack of 5. RoHS Compliant: YES