(Set of 4) Hipshot HB1 American Classic tuner for Bass guitar. Nickel finish. Right handed. Standard length key. 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 gear lash tension. The HB1 fits most G&L®, Music Man®, and some Gibson® basses. Mounting hole spacing is 13/16" across the top, 11/16" across the bottom, and 1-3/8" top to bottom(on center). Requires 11/16"(18mm) peghead holes. Includes bushings and mounting hardware. Made in the USA.