Here is a useful grit guide that I found on their website
Grit guide:
200,000 Grit, 0 to 0.1 Microns – The Finest Polish
100,000 Grit, 0 to 0,25 Microns – Final Polish
50,000 Grit, 0 to 0,5 Microns – Final Polish
14,000 Grit, 0 to 1 Microns – Final Polish
8,000 Grit, 0 to 2 Microns – Mirror...