Motion Pro, Pro Plug Socketâ„¢ 21mm spark plug socket

21mm socket, for most 14mm threaded spark plugs. Used with a 3/8" square drive or 17mm wrench. Allows a fixed or up to a 15° angle swivel drive when used with the 567325 optional wobble extension bar. The wobble extension is used to gain better (angled) access to hard to reach places.



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