These came in very handy when I needed to install a light in my car but will need depending on how thick the wire is You may need pliers. to cover the connections. Sometimes if you use too much force they still don't close completely and you have to bite the wire to clamp them. The wiring in my car is very strong. I've also used silicone coated wire (much softer) and these connectors worked great. Overall this is a good product and I will consider them again next time I need them.
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