Hipshot HB6Y-3/8 Ultralite Bass Guitar Tuners GOLD, " Key, 5-string Set Solid machined aircraft grade aluminum housing gives you high durability in an extremely light package. 20:1 gear ratio for super quick and accurate tuning. Tuning keys are easily reversible for conversion to bass or treble side. 3/8" string post fits 9/16" headstock holes Made in the USA