... Chilled steel, 2High-speed steel, High-carbon steel 1.vitrified cup grinding wheelhas good flexibility, high Intensity and high Wear-resisting ... steel, High-speed steel, High-carbon steel,Chromium corundumPAPink,rose-red Sharp cutting, good edges holdout, durableSuitable for form grinding, knives ... strength metallic and Nonmetallic material, i.e. single alundum vitrified cup grinding wheel