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The THSPS12166 is a spark plug socket designed for automotive and engine maintenance tasks. It’s used to remove and install spark plugs in car, motorcycle, and small engine engines, fitting snugly around the plug to prevent damage during tightening or removal. This socket has a standard 1/2″ square drive, meaning it fits common ratchet handles and breaker bars used in mechanical work. A rubber retaining ring or similar insert inside the socket helps hold the spark plug securely so it doesn’t fall off when working in tight spaces.