The Forney 72390 10-1/2-inch grinding wheel dresser is heat treated carbon steel cutters. To re-true and clean the surface of an abrasive wheel. Replacement cutters (Forney 72391) can be purchased separately. Forney Industries is one of America's longest operating family-owned metal working product companies. Founded in 1932, Forney offers more than 5,000 products for the hardware, automotive, farm and ranch and do-it-yourself markets. If you've got metal working questions, we've got answers. Were committed to your success regardless of location size or needs. 10 1/2 inch (266.7 mm) grinding wheel dresser. Claims for warranty must be made within 90 days of the date of purchase. Proof of purchase required. This warranty does not cover any product that has been subject to misuse, neglect, negligence or accident, or that has been used in any way contrary to the purpose intended.