Knobs designed for splined shafts have holes with multiple grooves or ridges that correspond to the splines on the shaft. Splined Hole. Other Splined Hole Knobs. 6mm Splined hole. The widest round part of the knob.
6mm Splined Hole Numbered Skirted Guitar Control Knob with Text Cap
Vintage Teisco Kent CHROME PLASTIC '60s Volume & Tone Knob Guitar Set JAPAN !
Guitar Tone Capacitory Tone Capacitor for Electric Guitar Enhanced Guitar Tone
