... ,highly brittle,sharp abrasive grain,good heat conductivity 1.green silicon carbide sharpening stone2.high quality, better price3.normal grain sizes ... iron, brass,l esd,zinc, rubber, leather, plastics, wood and metal ore6''x2''x1''(150x50x25mm) 8''x2''x1''(200x50x25mm) 8''x3 ...