- 25 White distance rings and washers each - For mounting 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 electric and acoustic guitars - Diameter black (inside / outside): 4.1 / 5.8 mm - Diameter white (inside / outside): 4.05 / 6.3 mm EUR 7.00 - See more - Buy online