EZELAP Diamond Products 2" x 4" Diamond Stones These diamond stones are perfect for hunting and fishing knives, woodworking tools, exacto blades, axes and industrial use. No oil or water is necessary, the surface will remain true and flat. Model 51 2" x 4" Diamond Stone Model Description 51SF Super Fine Grit (1200) 51F Fine Grit (600) 51M Medium Grit (400) 51C Coarse Grit (250) 51XC Extra Coarse (150) Model 52 2" x 4" Diamond Stone on a Walnut Pedestal Model Description 52F Fine Grit (600) 52M Medium Grit (400) 52C Coarse Grit (250)   Model 56 2" x 4" Diamond Stone with a Leather Pouch Model Description 56SF Super Fine Grit (1200) 56F Fine Grit (600) 56M Medium Grit (400) 56C Coarse Grit (250) 56XC Extra Coarse Grit (150)