Shafts diameter is 9mm (0.35") , Shaft spacing is 35mm (1.38"), Plate length is 118.9mm (4.68"), Plate width is 18mm (0.71").High class classical guitar tuner, three with a gold-plated finish and ivory color oval acrylic buttons for a stylish look.Designed to be long-lasting, dependable, and easy to adjust, screws are included, guaranteed high-quality guitar tuning keys, great to replace your old and dirty tuning pegs and great for guitar tuning.This guitar suitable for classical nylon string guitars. The tuning machines turn smoothly enabling the player to tune accurately and easily.1:18 gear ratio for precise and accurate tuning, high quality internal gear, effective to prevent screw slippage, configuration of three tuning pegs on a single plank, Ideal for tuning classic guitars.