Good replacement for many left handed imported guitars like after 2000 s Epiphone LP/SG/ES and almost all Ibanez/ESP/Cort guitars which made in Japan Korea China and Indonesia Metric size coarse 18 splines fit most Asia/Europe made 6mm(15/64 inch) split shaft potentiometers like Alpha NOT fit USA/imperial size potentiometers like CTS/Fender/Dimarzio/Bourns pots you can find our imperial inch size knobs for them Inner hole diameter: 6mm(15/64 inch) base outer diameter : 26mm(1-1/32 inch) height : 13mm(33/64 inch) Made of acrylic correct color shape and font it will dress your guitar/bass right Package includes: 4pcs knobs