I didn't inspect the shrink tubing pieces because the metal ring was so thin, lacking any durability it makes me wander what everyone else uses these for. I use Terminals in the automotive industry and these sure as heck don't cut it. I have been purchasing the e-Volt Terminals with great satisfaction, unfortunately the size I needed to restock the box was backordered.
This brand has maybe 1/2 the metal surface area that eVolt uses, maybe...or less. I put them in the trash.
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