Fender '62 'stack knob' Jazz Bass tone and volume dual 500K/250K pot, audio taper, made by CTS. Used for stacked controls on American Vintage '62 Jazz Bass® and Acoustasonic Telecaster®, and Nashville Power Telecaster® guitars. Concentric shafts, brass threaded mounting collar. Will not work with push-on style control knobs; set screw mounting knobs only. Please note that the top pot section is 500K and this controls the tone and is activated by the black lower knob. The smooth brass shaft that the larger black knob fits to measures .264" diameter. The smooth steel shaft that the smaller upper chrome knob fits to measures .185". The bottom pot section is 250K and this controls the volume and is activated by the smaller chrome knob. We include mounting hardware. Brand New. Genuine Fender 0019268049. UPC 885978546503.