Kluson Adapter bushings, 1/4" Black (set of 6) MB65B-L US
These Kluson steel replacement - adapter bushings are intended for use in converting a modern 10mm drilled headstock to accept a vintage Kluson stamped steel tuning machines with the original US 1/4 inch string post diameter. Many repair shops use these to convert a vintage instrument back to original peg head specs.
Outside diameter = 9.98mm
Inside diameter = 1/4 inch or 6.35mm