These are almost identical to the stock SR6 Beta 1 arms with the following differences:
Servo horn screw access
Slightly tighter tolerances (0.2mm on each side) at the end of the horn, for less wobble. Smoothing pass on the hard edges.
NOTE: Added 3mm and 4mm hardware versions to the zip, the 4mm version is for use with the stock BOM hardware, M4 bolts. The 3mm version is for if you are using 3mm hardware to attach arms to links.