Musiclily Metric Size Plastic Bell Hat style Speed Tone Control Knobs for Gibson Les Paul Style Electric Guitar, Black (Pack of 20) Metric Size, ideal for Asia made(China, Korea, Japan) 6mm diameter shaft import pots.Not for inch size pots like Fender, CTS, Dimazio pots. Tone knob, Alu surface top,plastic body with number. Top Diameter: approx. 18mm; Bottom of knob: approx. 25.5mm in diameter Metric Size is popular in guitars bass made outside the USA/Mexico. Package includes: 20 pcs tone knob