Schaller Locking keys 6R, with staggered posts. Satin chrome finish. 6-in-line, no screw tabs, pin mount, 16:1. Needs 10mm (13/32")-diameter mounting hole. The posts with the holes higher above the face of the headstock are used on the E, A, and D strings, the lower hole posts are for the G, B, and E strings. This gives the strings a steeper angle off the nut.