Jointer/Planer Blade Sharpener Diamond Knife Hone 300 and 600 grit in Wood Holder with Reversible Sharpening Stones KH-10D Keep your jointer and planes knives factory sharp w/o removing them from cutterhead Perform several strokes along both the bevel and face of your knives and youre back to work 300 and 600 grit diamond stones Sharpening stones are reversible