Top-hat-shaped knobs accept standard, "pan-European" 6-mm D-shaped shafts with a 4.5-mm flat.
Blue or white Indicator line or dot pointing references come in various orientations flat of shaft to 0, 90, 180, and 270°. The 16-mm knobs come in soft touch or hard plastic.
Elma Electronics Inc.
44350 Grimmer Blvd
Fremont, CA 94538