(4) Hipshot HB3 American Classic tuners for Bass guitar. Nickel finish. LEFT HANDED. The finest quality materials and precision engineering have been combined to make American Classics the best bass tuning machines you can buy. 27:1 ratio with adjustable tension. The HB3 fits most Pre-CBS Fender® Basses made before 1966 and reissues with large plate reverse wind keys. Will also fit other applications with 11/16"(18mm) peghead holes. Mounting hole spacing is 1-1/8" across the top, 1" across the bottom, and 1-1/2" top to bottom(on center). Includes bushings and mounting hardware. Made in the USA.