- 25 White distance rings and washers each - Mounted between the housing and the button of a closed-type guitar machine head, thus creating more spacing between the button and the headstock edge - For bass machine heads - Diameter black (inside / outside): 5.00 / 7.35 mm - Diameter white (inside / outside): 5.05 / 7.50 mm EUR 7.00 - See more - Buy online