Motion Pro 21mm Pro Spark Plug Socket

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21 mm Pro Plug Socket from Motion Pro. Features: Fits 21 mm and 13/16" spark plugs. Ultra-strong tool steel construction. Slim skeleton profile. Use with a 3/8" square drive or 17 mm wrench. Innovative internal plug retention system. Protective black oxide coating. Easy to read laser etched markings. Can be used as an axle-holding tool on bikes with 17 mm or 24 mm internal hex axles. Through hole allows use of a screwdriver or holding rod. Lightweight. Patent pending. Show more