How to buy a right Cbn Grinding Wheel?

How to buy a right cbn grinding wheel for your grinder machine and working-pices?

For a grinder machine, How to choose a right Grinding Wheel; There are some information to confirm:

1) To confirm the shape of Cbn Grindinig Wheel;

    6A2, 1A1, 12A2, 12V2, 9A3, 1A1R etc. 

2) Outer Diameter, Inner Diameter, Width of Rim and Rim Thickness; 

How to choose a right and suitable cbn grinding wheel for your work-piece?

1) Cbn grinding wheel is only for harden steel sharp;

2) Know the surface finish after grinding, like Ra0.1, Ra0.2 etc. 

3) To choose a professional manufacture.