The Binding Posts are used to connect stripped copper wire. The conductor is inserted through a hole in the threaded stem of the post and tightening the molded nut holds the conductor in place. It is used primarily in test fixtures. The Connector Test Adapters are a convenient way to connect banana leads to multi-conductor pin and socket connectors like D-sub connectors used in the computer industry and circular “harsh environment” connectors used in avionics.