These are solid metal and are pretty well built. The wire soldered between the two connectors is very thin -- probably 26 gauge single strand copper wire.
That is sufficient for audio use, but not for DC power usage.
However, the fact that these can be disassembled means that with just a bit of modification, they can be upgraded for DC power usage. I took out the screw that held the XLR connector in place, and was able to replace that thin wire coming from the #1 terminal with a chunk of 18 gauge insulated stranded wire that I soldered in it's place. That formed my positive polarity connection between the XLR connector and the center pin on the RCA connector.
I bridged the #2 and #3 terminals together with a small chunk of un-insulated 18 gauge wire that I pre-tinned and bent into a "U" and soldered into place. This bridging is necessary as the screw that holds the xlr connector in the housing threads into the #3 terminal metal, and forms the ground connection to the housing.
Note: It helps to start a bend in the longer #1 wire that goes to the center post of the RCA connector. That way, as you push the RCA connector back into place the wire already has the necessary bend started to take up the "slack" from the wire.
The RCA connector at the other end is just lightly pressed into place, so I was able to dislodge it with a small flat bladed screwdriver and tap it out with a small hammer. Be careful when soldering to the RCA connector as it can easily start melting the nylon holding the center pin in place.
Note that the ground side of the rca connector relies on that press fit -- so make sure you tap it back into place or you may experience some poor ground connectivity. I suspect that those using this for audio may get some electronic noise if the RCA connector works it's way out from that pressed fit.
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