... Chilled steel, 2High-speed steel, High-carbon steel 1.vitrified cup grinding wheelhas good flexibility, high Intensity and high Wear-resisting ... for grinding Hard alloy, Optical glass, vitrify, gem, agate, honing cylinder sleeve and other hard friable materials.4.Please mark in ... strength metallic and Nonmetallic material, i.e. single alundum vitrified cup grinding wheel