In my bucket of marr connectors I have this little tool which will fit into a standard hex tool socket.

Not sure where it came from but I have used it a couple of times.
It will not work for the large size connectors  or the very small connectors.

There is also https://rack-a-tiers.ca/product/nut-blaster/




On 2025-09-10 14:56, James Knott via Talk wrote:
On 9/10/25 14:46, William Park via Talk wrote:
What tool or adapter do you use to twist electrical wires?
It's been years, but I used to use Marr or Marrette connectors.  The
Marr connectors are used for solid wire, but the Marrette connectors 
can be used for solid or stranded.  They were also an approved method
for connecting aluminum wire.

Side note, the inventor, William Marr, lived in Toronto and worked for
Ontario Hydro.
https://en.wikipedia.org/wiki/Twist-on_wire_connector
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