Gotoh 1-5/8" (R2) 'bottom mount' locking nut. Includes lock nut assembly with mounting hardware, string retainer bar, 2.5mm and 3mm allen keys, and height adjust shims. - Base measures 1-5/8"(41mm) x 19/32"(15mm). - String spread is 1-11/32"(34mm). - Nut mounting holes are spaced 17/32"(14mm). - String Retainer mounting holes are spaced 1-1/8"(28.5mm). - Also fits guitar equipped with "bullet" style truss rod nut. - Made in Japan - Chrome Finish