MIJ Customized Speed Knob Set 4pc +Toggle knob Inch White Brand New Made-In-Japan Customized Speed Knobs for Inch Set 4pc + Toggle Switch Knob Replacement control knobs There are "Wave Embossed" for better grip. These knobs are for inch size POT (for ex.CTS ). If your guitar's POT is mm size (for ex. Japanese,Chinese,Korean ), please choose same one for metric. Toggle Knob inner diameter: 4mm