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3M communication and production lines have been acquired by Corning, so now all the packaging is Corning, the products are the same original authentic, please rest assured to buy Main function: two-wire docking (under the condition of low voltage and the wire core is 0.4mm--0.9mm in size, the wire can be inserted into the wiring terminal hole) using the wiring terminal can connect the two wires together, so as to achieve a line to transmit signals . The most commonly used places are telephone lines and network lines. Installation method: Insert the two wire ends into the terminal hole, and then use a vise or other pliers to press down the protruding cap of the terminal until the two wires are pressed tightly.