This Kluson 6-in-line tuning machine set has oval metal (butter bean-shaped) buttons and the improved 15:1 gear ratio for more stable and accurate tuning. The housing and button style are period correct for 1965 - 1969 production dates. These feature the Kluson Safety Post. This set comes complete with 6 bass side tuners, 8.8mm O.D. vintage bushings with 1/4 inch I.D. and mounting screws (TMSC) needed for installation.