Phenolic skirted knobs with a set screw and brass insert. These unique knobs closely match the RCA style of knobs used on vintage test equipment, radios, studio consoles and other equipment. They are sometimes referred to as fester knobs. The RCA style knobs feature an inlay indicator line. Fits ¼” (6.35mm) pot shafts. 22mm Skirt: Height: 0.495in. (12.6 mm) Diameter: 0.875 in. (22 mm) Fits ¼" shaft with set screw