Grover 205BC6 Rotomatic Mini 6 in Line Machine Heads, Black Chrome Small and lightweight, this precision machine fits guitar headpieces that will not take full size machines. The mini buttons provide more space for players' fingers (even larger fingers) to tune strings. Gear ratio is 14:1. Sealed-in lubrication keeps Mini-Rotomatics perfect for a lifetime. 6 Inline configuration, Black. Totally professional in design and performance. Includes 5/8" washers, bushings and wood screws.