An interesting pre-wired pair of 5.5/2.1 Plug and Socket (5.5mm outer with 2.1mm inner, 5.5x2.1), the interesting bit is that they are twist-lock (bayonet style), put together and twist and they lock together so they can't be pulled apart easily, twist the other way to unlock.
Apart from that they are pretty standard. 22AWG, PVC double insulated wire. Availavble in lengths as per selection (end to end means joined togethor from the outer insulation on one end to the outer insulation on the other end).
Don't know exactly what they would be useful for, but they looked useful.
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