Ball Chain #10 'B' Couplings Nickel Plated Brass 50 Count Used as a Connector/Attachment for #10 size Nickel Plated Brass & Nickel Plated 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 Regular connectors are not available for #10 size ball chain Made in USA by Ball Chain Manufacturing Since 1938. We are the manufacturer, not a reseller.