Good replacement for USA made guitars and basses, including Fender Tele/Strat/Precision Bass/Jazz Bass and other similar style guitar bass Inch size, fine 24 splines, will fit most American made 6mm(15/64 inch) split shaft potentiometers like CTS/Fender/DiMarzio/Bourns, will NOT fit metric size potentiometers like Alpha Inner hole diameter: 6mm(15/64 inch), height: 16.5mm (21/32 inch), outer diameter: 19mm(3/4 inch) Steel made, dome, top decorated with natural abalone, knurled, quality hand feeling. Push-on style knob, convenient to use