Ukulele DIY Unfinished 23 inch Concert Ukulele Neck Fingerboard For Ukulele Luthier Parts (OT0169) 23'' Concert Ukulele Mahogany Neck For Ukulele Luthier DIY. Attached 18 frets Rosewood fretboard/fingerboard. Perfect ukulele neck for DIY your own ukulele. The neck is pre-drilled 4 bigger holes ,10mm