Hipshot 18mm Nut for 1/2" Ultralight Tuners - Set of 4 Allows you to install 1/2" Ultralight USA tuning machines on headstocks with 18mm holes.Hipshot 18mm Nut for 1/2" Ultralight Tuners - Set of 4SKU: 0206-0708X0500-NUT-NCA$36.00PriceQuantity*Add to CartBuy Now