Bought a pack of these (much more than I will ever need) on a flyer. You'll need channel-locking pliers to hook the V-blades onto the wires to be joined, and a bit of fiddling to engage the connector, especially if the secondary wire is larger than 18 gauge. But they work. If you only need a few I would try the Scotchlock brand and pay a bit more assuming you have less time wiring and shorting.
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