Double-Reinforced Cutting Wheel – We’ve double-reinforced our abrasive cut-off wheels with fiberglass to provide added durability and longevity Made in USA Cut-off Wheels – You can trust the materials and the manufacturing process used for our abrasive cutting wheels, as they are made in the United States Suitable for Multiple Metals – It’s perfect for cutting carbon steel, cast iron and general-purpose metal Made for Aggressive, High-Speed Cutting – Our wheel can spin at a maximum speed up to 21,000 revolutions per minute. For safety, be sure to use with a guard 10-Pack of Wheels – This kit has ten wheels, so you’ll always have plenty of cut-off wheels on hand to finish the job and to start the next one!