Genuine Fender® S-1 knob Designed to Fit the Fender Tele®/P. Bass®. Chrome. Package includes knurled chrome knob, cap, coupling sleeve, and set screw designed to be used with an S-1™ Switch. Fits 1/4 solid shaft controls. The S-1 switch can be retrofitted to nearly all Telecaster® and Precision Bass® models (US and Mexico) produced from 1951-Present.