additional grinding at a smaller grit size can be done. Typically, two or three stages of grinding are used, with the second and third stages having a size that is decreasing. For example, a typical set of grit stages is 30 micrometer, then 15 micrometer, then 9 micrometer. An alternate set of typical grit stages is 20 micrometer, then 12 micrometer, then 5 micrometer.

Types of abrasives include aluminium oxide, industrial diamond, and silicon carbide. Diamond