Ball Chain #10 'B' Couplings Stainless Steel 50 Count Used as a Connector/Attachment for #10 size stainless steel ball chains 'B' Couplings can also be used to form adjustable loops with the chain 'B' couplings are also available in other materials to match each specific chain type #10 stainless steel chain is available and sold separately Made in USA by Ball Chain Manufacturing Since 1938. We are the manufacturer, not a reseller.