The old pultruded Bemans were 15/64 for the lighter sizes, and 16/64 for size 60/80 on up.
The Axis arrows (if I read correctly) are 17/64 for sizes through size 400 and 9/32 (18/64) for the 340s and 300s.
Mine are definitely thinner than ICS or ACC 3-60s that I have. Enough difference in diameter that I bought an ICS Biscuit to try instead of the Aluminum biscuit that I usually use. They are heavy walled, and look pretty tough, spin broadheads near perfectly on every shaft of the dozen. I don't know about fletching, since mine came already fletched. I am anxious to shoot them to see how they do, but can't right now until I am finished with my form work. The temps and wind here are making it easier to wait to shoot though.