2 Set Musical Instruments Category: 6 x Chord Cap Potentiometer and 4 x Guitar Thumb SelectionDurable Guitar Thumb Multiple Holiday HomesProtect Your Thumb from DamageRing Design, Easy to UseExcellent value accessories, used for most electric bass guitar with 6mm split shaft pots. No screw hole for 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: Approx. 18mm / 0.70in. Length: Approx. 18.2mm/0.71in. Hollow shaft diameter: about 6mm/0.24inch. Package Contents: 6 x Potentiometer Chord Nut4 x Guitar Thumb SelectionNote: Random color, do not accept specific color. Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement error is +/- 1-3cm.