If you are roughing, choose a 36 to 80 grit.
If you are intermediate grinding, use 80 through 180 grit.
If you are finishing, use 220 through 240 grit.
What are the three basic raw materials used in the manufacture of coated abrasives?
Grain – a synthetic or natural abrasive; Bond – an adhesive that permanently bonds the backing to the abrasive; Backing – a backing that the abrasive is bonded to