These are crimp connectors that don't crimp well. In fact one I had split. I don't think I was using the crinp tool wrong. Anyway, with a smooth polished finish and a poor crimping performance, the let go of wire at the slightest pull. I ended up using cheaper gold flat pin connectors after too many of these failed on me. I also used RCA brand connectors with a set screw and they also performed better than these.
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