the size specifications for each 'grain' is equal to or less than 1.4 mm for 95% of the material
Below is a comparison of the different grades for your information
Industry Standard Product Size Mesh
Regular meal * < 2.2 mm 95% under this size.
Fine meal * < 1.8 mm 95% under this size.
Extra fine meal * < 1.4 mm 95% under this size.