Studer 10.5mm Wide Step and Profile Dressing Grain Diamond / ID: BTS

Form or step dressing suggest for 12" diameter 2"width wheels. 10 mm x 12mm hand set grains.
W Tungsten hot-pressed bond.
Side mounted plate is set to 5mm x 10.5mm x 19mm blade and set at 0 degree angle. Studer Number 1 Morse Taper 20mm long shank.
Suggestions for Wheel grit size:
Part Code. Wheel grit size.
BTS-33 80-100
BTS-35. 60-80
BTS-37. 35-50