#10 Stainless Steel 4.5mm connectors, 50 pieces. #10 stainless steel 4.5mm connectors are used as connectors for the #10 size stainless steel ball chain. Ball Chain connectors are used to join ends of ball chain together to form loops such as those in neck chains, dog tag chains, key chains, bracelets, and custom chain assemblies. Our chain is everywhere, and our quality is second to none. Don't settle for low quality overseas imitations. Whatever the application, this chain will last.