Universal fitting control knobs fit for most guitars and basses like Fender Squier Tele/Strat/Precision Bass/Jazz Bass and other style guitar bass Compatible with most potentiometers on market including 6mm(15/64 inch) solid shaft coarse spline and fine spline split shaft 6.35mm(1/4 inch) shaft potentiometers fit all the America/Asia made pots for guitar bass Height: 19mm (3/4 inch) outer diameter: 19mm(3/4 inch) inner hole diameter: 6.5mm(1/4 inch) Quality steel made flat top knurled quality hand feeling with set screw to secure the knob to the shaft. You need to tighten the set screw in line with the split when installing this knob on a split shaft pot Package includes: 2pcs knobs and screwdriver