Makanu Ukulele Tuning Pegs 2R2L ukulele tuning machines Chrome Slivery Tuner Guitar Geared 4pcs Quasi-closed Chrome Surface Machine Heads With Chrome Buttons Brand quality Brand Service 4 pieces for one set 2R2L Different with Opean-Gear Tuning.The Longest Diameter is 10 mm(0.39 inches),it suits for using Quasi-Closed Ukulele.