Schaller G-Series Deluxe Keystone Machine Heads Execution: 3 left 3 right Wings: Keystone double ring Shaft length: Solid Headstock 21, 7mm (Standard) Ratio: 1: 16 Including: 6 banjo bolts, 6 washers, 12 mounting screws Finsih: Nickel Draw a classic look and optimized functionality this mechanics. Fits with vintage original specs for many historical and modern guitars. Permanently lubricated mechanics with precision machined parts and perfectly machined surfaces. The self-locking drive ensures even, fine and stable tuning.