Set of 4 (4X) CTS 500K Short Split Shaft Audio Taper Potentiometers CTS 500K Split Shaft Audio Taper Pots - 3/8" bushing height and diameter - Part #450S4072 Aluminum bushing and shaft .236 diameter fine spline shaft for use with push on knobs Suitable for either volume or tone controls - 15% Tolerance Imperial (U.S. sizing) not for use with guitars using metric components