Vintage style tuners retrofit guitars with 21/64" (8.5mm) headstock holes
Grip-Lock pin and thumb wheel system clamps onto your string, no wraps needed
Schaller® M6 Mini footprint
Included UMP (Universal Mount Plate) means no drilling or filling
Staggered post option gives each string the ideal break angle over the nut
15:1 tuning ratio
Upgrade your tuners to improve the tuning accuracy and stability of your guitar with our Tuner Upgrade Kit. With the patented UMP™(Universal Mount Plate) included free in this kit, tuners will retrofit without drilling or screwing.