The 6728-0 is a black standard sheath banana jack to non-sheath banana plug Adapter. It provides an easy and quick conversion from a standard sheathed banana plug/patch cord to a standard exposed banana plug. Allows standard sheathed banana plug/patch cord to connect to non-sheath style banana jack or blinding post. Ideal for environments using a mixture of sheathed and non-sheathed style patch cords. Banana jack is made of brass with nickel plated finish. Banana plug is made of beryllium copper with nickel plated finish and nylon 6 insulation.