These banana plugs work best with 12 AWG stranded wire. If heavier gauge wire is used, the insulation may not fit inside the sleeve. If smaller diameter wire is used, there will be a gap in the barrel when the bushing is inserted and the wire will become loose. The red and black plastic rings can be removed for a tighter fit. My only wish is for the case to be fully seated in the barrel when bolted down to support any gauge of wire.
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