Review on Insulated U Type Connector Electrical Terminal Hydraulics, Pneumatics & Plumbing by Michael Jennings

I don't know why I would ever take the risk of buying these as it is typical of most Chinese made terminals you find online and the Harbor Freight is flimsy cheap crap . They are no exception and absolutely don't last long on the wire you crimp them to because they are so flimsy. If you crimp these terminals onto a wire and feel them tight at first, the contraction and expansion will loosen them after about a year of temperature fluctuations. Then you have a short circuit that can start a fire or leave you stranded. Go to Home Depot or Lowes, look at the more expensive ones and compare the difference. They are not as expensive as fire or worse! I would never buy them for electrical purposes.