GZ. . .
Carbon arrows for regular bows are smaller OD. For crossbows, the OD must be the same or very close, so the carbons for xbows are the same 22/64ths diameter.

I use the JoJan. It fits tight to the 22/64ths shaft, whether is is carbon or aluminum. The JoJan is pretty good IMHO, but requires you fine tune things a bit to make it 100% consistant.