You seem to be having the same sizing problem as the other reviewer. The male end should be tapered at the inside diameter. Only fits about half of the 5.5 x 2.1mm sockets I have. Not worth sending back so I just cut off the pin ends and solder on new ones that go with everything. I can confirm the 22 AWG stranded wires inside and they appear to be solid copper rather than copper clad aluminum.
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