Tormek SG-250 Supergrind Grindstone the balance of efficient steel removal, smooth surface finish, and long-lasting durability. This grinding wheel is designed to cut all types of tools and steel qualities, including high-speed steel (HSS), with exceptional efficiency. Its unique stone composition, combined with the Stone Grader SP-650 (sold separately), provides two different cutting actions in one stone. The Stone Grader polishes the grindstone surface from its standard 220 grit to a finish comparable to a 1000 grit stone, allowing you to perform both fine sharpening and initial shaping with the same jig setting. This grindstone is i for a wide range of materials, from carbon steel to high-speed steel, making it the go-to choice for those seeking both effective steel removal and a fine finish. It fits Tormek T-8, T-7, and earlier models with a 10" (250 mm) stone diameter. Model Number: SG-250