^ Agreed, but I imagine that anyone buying a spark plug socket set, would already have a 3/8" ratchet. Different lengths and types of swivels are handy for spark plugs too, though the swivel on these sockets could be enough.... depends on how tight the engine bay and what's in the way, or you might not need a swivel at all for an inline 4 cyl opposed to a V-engine.
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Thank you!