... order, shape, size, abrasive material, grain, grade, , and speed.2.Suitable for the work pieces made of materials Chilled steel,3 ... weaker flexibility than A.Suitable for the work pieces made of materials Chilled steel, High-speed steel, High-carbon steel, ... Chromium corundumPAPink,rose-red Sharp cutting, good edges holdout, durableSuitable for form grinding, ...