4 Pcs Thumb Guitar Pick Celluloid Mediator Thumbpick with Electric Guitar Volume Knob Potentiometer Chord Cap

no screw hole on the knob designed.
Style: guitar speed control knobs.
Material: Zinc alloy + Celluloid
Size: width 32x height 15mm, thickness 1.5mm
Color: random color + Silver
size: Diameter: 20.2MM
Body diameter: . 18mm/0.70inch.
Length: . 18.2mm/0.71inch.
Hollow Shaft Diameter: .6mm/0.24inch.
Package Contents:
6 x Potentiometer chord cap
4 x guitar thumb selection
Note: Random color, don't accept the specified color.
Only the above package content, other are not included.
Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.