Brand New in package unused Gotoh top mount LOCKING NUT 43mm complete set with all mounting hardware, string retainer bar, metal shim and wrenches. This is a vast improvement over your locking nut if you are not already using OFR, Gotoh or equivalent quality. The cheapo nuts can’t clamp down the strings tight enough, causing them to slip, causing tuning instability. No such problem with this high quality and durable locking nut. Install, play, enjoy and forget. Made in Japan.