Genuine Grover Mandolin Pro/A Style Nickel 4+4 set
P17Manufacturers Part Number: 309N
These new, professional model mandolin machine heads are the latest in technology. A specially designed, adjustable worm gear along with the die cast base maintains the center lines of the gear and worm to insure correct alignment for the finest tuning possible. The worm to gear ratio is 18:1. Available in A, F, and F Vintage styles. Screws and bushing provided.