Ryujin has really knocked it out of the park with this Sharpining Stone!2-in-1 sharpening stone: Hand-made from high-grade white corundum, after 1250 degrees high temperature and 17 procedures forge, triple test, corrosion-resistant, heat-resistant, edges and corners are clearly demarcated. ?Coarse side (1000 grit) for sharpening blade,quickly sharpen dull or damaged knives, make the notch and glitch flatten. ?Fine side (6000 grit) for finishing and polishing the blade, make the edges sharper Easy to use: ABS Plastic holder with silicone padded base for superior grip on any surface. Angled based allows user safely apply pressure and correct angle for best result.