Schaller Lyra NI Acrylic, Machine Head Set for Classical Guitar, Configuration: 3 Left / 3 right, The worm, worm gear and shaft are manufactured with the highest precision and mounted on a torsion-resistant base plate, Bearings made of particularly smooth material, Construction: Open, Buttons: Acrylic, Gear ratio: 1:16, Shaft length: 14.6 mm, Bore: 10 mm, Center distance: 35 mm, Fastening via screws, Schaller number: 10340163.31.13, Surface: Nickel, Fixing screws included, Made in Germany