The Goldo Tuner Staggering Set (MFG# WKSGB) contains 9 black washers of different thicknesses that can be added to the base of most tuning keys utilizing a 10mm tuner hole, reducing the height of the tuner shaft and gives a staggering effect to your tuning keys.  This ensures a proper break angle from the string as it goes over the nut and into the tuner post, eliminating unwanted noise and string buzzing.