Different with Opean-Gear Tuning.The Longest Diameter is 10 mm(0.39 inches),it suits for using Quasi-Closed Ukulele.
Note: The color of the item may vary slightly due to photography and your own computer High quality Quasi-closed UKULELE machine heads 2R2L TUNERS CHROME surface machine heads with CHROME buttons Material: Alloy Gear Ratio: 1/17 The tuner hole diameter: approx. 10mm/0.394 Shaft length: approx. 24mm /0.945inch Weight: 108g Package Content:4 x Ukulele machine heads