The Grover GRO102 Original Rotomatic Machine Heads are renowned for their quality and design, and they are suitable for guitars with 3 tuners on each side of the headstock (3-a-side configuration). Here are the key features:

1. Machine Head Style: These machine heads have an original Rotomatic design with deluxe diecast housing. The chrome finish provides a classic look that complements various guitar styles.

2. Gear Ratio: The machine heads feature a high-quality 14:1 gear ratio. This gear ratio is designed for precise and smooth tuning adjustments.

3. Precision Engineering: The housing is engineered to provide maximum support for the worm, gear, and string post. The worm and gear are precision-cut to ensure perfect meshing, which eliminates backlash and slippage.

4. Tension Adjustment: These machine heads include a countersunk tension screw that allows the player to adjust the turning tension to their preferred level. This feature provides flexibility for tuning preferences.

5. Lubrication: The gear box is equipped with special lubrication for lifetime, trouble-free service. This ensures the smooth and reliable operation of the machine heads.

6. Package Contents: The set includes 5/8" washers, bushings, and wood screws, making them convenient for installation.

The Grover GRO102 Original Rotomatic Machine Heads are known for their exceptional quality and precision engineering, offering guitarists reliable and smooth tuning capabilities while enhancing the aesthetics of their instruments.