Sterling Silver Wire Loop Protector (Cable Thimble) Beads. This bead is use to protect the cord from rubbing on the ring for long lasting jewelry. Not sure what size to get? We have a mix pack, 10 pieces of each size, total 30 pieces. Size: Small - size: 4.5mm x 3.5mm; hole size: 0.021", approx. 0.533mm, fits up to 24 gauge cord/wire Medium - size 4.5mm x 3.5mm; hole size: 0.031", approx. 0.787mm, fit up to 20 gauge wire, thread, cord. Large - size: 5mm x 5mm; hole size: 0.045", approx. 1mm, fit up to 18 gauge wire. Sku: F124 If you need a different quantity, please let us know and we can make a listing for the quantity requested.