Musiclily Plastic Stove Top Style Control Knobs for Preamp Amplifier Effect Pedal Guitar Bass Replacement, White (Pack of 12) For guitar bass and amp knobs replacement, flat head style Small size, fits 6mm shaft diameter import concentric pots and split shaft pots.Not for Fender,CTS,Dimazio pots. Material: Plastic; Color: White; Metric Size is popular in guitars bass made outside the USA/Mexico. Length:21.5mm,Width:16 mm,Height:13 mm Package include: 12 pcs knobs