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According to this WikiHow article, one of tools needed to change a spark plug is "an extension." Is this a type of wrench?

7

The tool referred to is an accessory for a ratchet/socket wrench setup. It simply allows one to access fasteners that are inside deep holes.

It has a female square drive on one end--this connects to the ratchet; and a male square drive on the other end--this connects to the socket.

Extensions of various lengths

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Ratchet with Extension and Socket in place

Ratchet with extension and socket

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