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For use with 5/8 inch spark plugs. Special thin wall design fits in tight spaces. Perfect for use on water cooled four strokes with 5/8 inch spark plugs. Fits many HD models, KTM four-strokes, DR-Z400, CRF450R, YZ/WR400/426F, YZ250F, KLX300, DVX400 and many other motorcycles and ATVs with 5/8 inch spark plugs. Unique two step extension. Swivel or fixed. 3/8 in. drive swivel extension can be turned with a Phillips screwdriver, 1/4 inch ratchet or driver or 14 millimeter wrench or socket. Spark plug socket can be turned with 3/8 inch driver, 19 millimeter wrench, or 19 millimeter socket.