Fender Jazz Bass knob set, black phenolic plastic with white indicator line. Allen set screw fixing to standard 1/4" USA pot shafts. As found on '60s instruments. Set includes two large volume knobs and one small tone knob, fits older Jazz Bass and reissue instruments. Volume knob measures .997" diameter X .593" height overall. Tone knob measures .755" diameter X .431 height overall. These knobs require a 1/16" allen key for installation. Brand New. Genuine Fender 0991370000. UPC 717669509040.