Musiclily Plastic Big Chicken Head Guitar Bass Control Pointer Knobs for Electric Guitar, Black(Pack of 12) big long chicken head style, for electric guitar or bass Fits 6mm shaft diameter import concentric pots and split shaft pots.Not for Fender,CTS,Dimazio pots. Material: Plastic; Color: Black;Metric Size is popular in guitars bass made outside the USA/Mexico. Big central hole: approx. 18.5mm diameter; Hole for pots shaft: about 6mm diameter;Height: approx. 13.5mm; Length of knob: approx. 31mm in diameter Package include: 12 pcs Pointer Knobs