Step and Profile 20mm Wide Dressing Grain Diamond Plate

Form or step dressing suggest for 16" and over diameter wide wheels. 20 mm x 10mm hand set grains.
W Tungsten hot-pressed bond.
Side mounted plate is set to 5mm x 20mm x 28mm long blade with 6.3mm mounting whole.
Suggestions for Wheel grit size:
Part Code. Wheel grit size.
BT-23 80-100
BT-25. 60-80
BT-27. 35-50