Our 3/8" Conversion Guitar Tuner Bushings come in round and hex shape bushings for adapting 1/4" string posts to fit larger pegholes. Set of 6. Adapts s 1/4" string post to fit larger pegholes. Our special tapered knurled press-fit brass bushings let you install Waverly or other tuning machines with 1/4"-diameter string posts into 3/8" or 10mm pegholes (such as those used for Gotoh/Grover/Schaller tuners) without the need to plug and redrill the pegholes. For a perfect fit, we recommend a .393" diameter reamer to cut a clean, accurate counterbore. Note: these conversions bushings will NOT work on instruments with 10.5mm pegholes. Measure the tuner peghole diameter prior to ordering. Specs for our round shape 3/8" conversion bushings: Outside diameter at top of taper: 0.394" (10.01mm) Outside diameter at bottom of taper: 0.375" (9.53mm) Round-shaped collar diameter: 0.437" (11.10mm) Sold as a set of 6 nickel bushings.