#10 'B' Couplings can be used with the #10 size ball chains to join ends of the chain to form endless assemblies. You can also use the B type ball chain coupling to attach plumbing parts and accessories such as sink stopper and drain plugs.
Coupling Size: #10 chain
Hole Size: .190 inches
Material/Finish: Nickel Plated Brass
THE ONLY TYPE B COUPLING THAT IS MADE IN THE USA
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The nickel plated brass are exactly what I needed. The came on time, and they are very easy to use.