The Forney 71748 3-Inch Aluminum Oxide Quick Change Steel Sanding and Grinding Wheels are excellent quality aluminum oxide. Ideal for weld grinding, blending, finishing, deburring and other general purpose applications. Can be used on most types of steel as well as fiberglass and plastics. Uses a special heat treated (ceramic coated) aluminum oxide grain for fast cutting action and long life. 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. 4-1/2-Inch (114.3-mm) aluminum oxide Type 1 steel sanding and grinding wheel. 7/8-Inch (22.23-mm) arbor size. 80 Grit. 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.