So I have never really measured a 6 armed core. With that said, does anyone know what the measurements are for one?

The core fits inside a 19mm cube, and diameter of each arm is 9mm, with 3mm wide hole (for M3x20mm screws).

So each arm protrudes from the 4 adjacent arms by: (19mm - 9mm) / 2 = 5mm.

These are maximum dimensions. Of course it will still work if the length and diameter of each arm are smaller, as long as the screws are long enough to reach into the arms and hold firmly in place.

Thanks! I am working on something special that's why I needed the measurements.