These crimps are used to join 0.5mm telephone wire which is a standard telephone cable. It can be used internally or externally as the waterproof gel stops the wires from corroding. They are much better than using screw terminal blocks as they do not degrade the broadband signal. They are very simple to use, insert one wire in each hole and just squeeze down using pliers. The wires do not need to be stripped as the IDC connection in the crimp does that for you.
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