Schaller Locking 6-In-Line Guitar Machines Smooth 16:1 gear ratio, with a rear thumbscrew to lock the string. Pin mount on the tuner back keeps it from rotating, no mounting screws needed. 16:1 ratio 10mm (13/32") diameter pegholes required Removable metal knobs Set of 6 Staggered string posts: The Schaller Locking 6-in-line tuners feature staggered string post holes. The tuners with the holes higher above the face of the peghead are used on the E, A, and D strings, and the shorter hole posts are for the G, B, and E strings. This allows the strings to have a steeper angle off the nut than with traditional tuners — eliminating the need for string trees.