Motion Pro 08-0239 5/8" 4-Stroke Spark Plug Tool For use with 5/8 inch spark plugs Perfect for use on water cooled 4 strokes Special thin wall design fits in tight spaces Spark plug socket can be turned with 3/8 in. driver, 19 millimeter wrench, or 19 millimeter socket Fits many HD models, KTM 4-strokes, DR-Z400, CRF450R, YZ/WR400/426F, YZ250F, KLX300, DVX400 and many other motorcycles and ATVs with 5/8 inch spark plugs