21mm Pro Plug Socket

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Fits 21 mm and 13/16in. spark plugs Ultra-strong tool steel construction Slim skeleton profile Use with a 3/8in. square drive or 17 mm wrench Innovative internal plug retention sys tem 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 screwdriver or holding rod Light weight Patent pending. Show more