The SD series combines “Rock-solid” technology and the post collar or: “Self-Center Guide” found on enclosed gears in the gear's base plate, allowing the post to perfectly align itself with the bushing that attaches the gear to the headstock.
The SD series uses a torque balancer to ensure steady rotation of the tuner button, giving a high-quality sound performance and great functionality.
Mounting hardware included: bushings, washers, and screws.