The material is quite thin. They bend easily even with a slight tug on the wire. They get hotter than I would like with 30 amps running through them. They don't hold the wire very tight. It is NOT recommended to use ratcheting pliers unless you are soldering the wire. Otherwise, the wires will be pulled out immediately. If you don't plan on soldering them, use some old school Klien or Channellock pliers. Definitely not recommended for mission-critical connections.
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