Sharpening stones are composed of abrasive material to clean, hone, polish, and sharpen cutting edges. Dual-grit sharpening stones have different grits on opposite stone faces for shops where stones are routinely used for multiple stages. Single-grit sharpening stones are used in shops where refining the sharpening process isn't required. Diamond sharpening stones are very flat for fast, accurate sharpening. Three-grit sharpening systems include three sharpening stones on a single, rotating plate. Sets include a variety of commonly used stones. Accessories for sharpening stone include bases and oil to improve use.