Ball Chain #3 Connectors Stainless Steel 100 Count Attachment for #3 Stainless Steel ball chains (chains sold separately) #3 size chain has a bead diameter of 3/32" (2.4mm) Rustproof T304 Grade Stainless Steel #3 ball chain is the common chain size for dog tag necklaces Made in USA by Ball Chain Manufacturing Since 1938. We are the manufacturer, not a reseller.