IKN Guitar 4 Volume and 8 Tone Control Knobs Sets Plastic Black for Fender Strat Style Guitar Great replacement for Fender Strat Style Guitar 4 Volume and 8 Tone Knob Sets Speed control knobs, Split Shaft: 6mm(about 0.24 inch) Material: Plastic Top of the knob: approx. 17mm diameter; Bottom of the knob: approx. 25.5mm in diameter