Home made automotive carpet hole cutter. It's made from end of a bent GMT400 jack tool, cut it to a useable length, used a Dremel tool to get an inside edge and finished off the outside edge with the bench grinder. Found a deep 10mm socket and stuck it in the other end, wrapped some gorilla tape around it to join the socket and tool... makes nice, clean holes in carpeting in a few seconds. It will score the floor pan a bit and has to be sharped after a few holes but it works great.
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