Gotoh 301 Series Tuners, Magnum Lock. 3 Aside. Set of six. 18:1 ratio. Simply insert the string through the hole, pull to tension by hand and begin tuning. As you tune, only the locking cam in the post turns. Once the string begins to turn, it can be tuned to pitch. In less than one revolution of the post, you will be in tune and locked. Will fit headstock holes that are drilled out to 10mm diameter. Featuring Gotoh's revolutionary Rock Solid posts for unrivalled tuning stability and "Lubri-Coat" technology that reduces friction between the gears resulting in an ultra smooth feel and minimal back lash. Screws, washers and bushes included.