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It’s not really what the holes were made for, but there are some extension cords that have a locking feature; a pair of plastic pins moved by a lever that lock into those holes preventing it from unplugging. Handy for dragging power tools around the shop.
We just always made a loose knot where they joined.
Keeps the cords from coming unplugged and reduces the stress on the plugs
Not really great for the cords to do that tho
