Davies style 1510 knobs. Available in a variety of colours. Sold individually.
Overall Height: 5/8"
Base Diameter: 3/4"
Ideal Shaft Fit: Solid Shaft
Fit Type: Flat Set Screw
Tech's notes: "Knobs sized for solid shaft pots will fit all pots, but may be slightly off-center when used on 6mm split shaft pots."