The bead on these is actually ATTACHED to the captive and does not come off. In order to get the ring open you need to bend it back/forth.
Standard bead sizes for each gauge are: 20ga= 3/32"; 18ga= 3/32"; 16ga= 1/8"; 14ga= 5/32"; 12ga= 3/16"; 10ga= 7/32"