This die-cast set of four WD Music Products Mini Bass Tuners is for instruments using four per side tuning machine configurations.

Each set includes four bass side Tuning Machines along with bushings, washers, and mounting screws.

String Post diameter: 7/16"

Bushing Type: Screw In Threaded

Peg Hole Size: 9/16"

Gear Ratio: 20:1.

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