Guitar Parts Zone Potentiometer Set inclusive with 2 A25k, 2 B25k controls and 2 .047 Capacitors. Ideal for controlling the volume or tone of active pickups, or for use after the preamp of a piezo-saddle transducer bridge. Each pot has an aluminum split shaft, 6mm, that fits a coarse-knurled ( 16 spline ) knob. Each pot includes a flat washer and two hex mounting nuts for custom height adjustment on a pickguard or control plate.