Gyros ST 11-42502/50-Fiberglass Reinforced Cut Off Wheel, 2-1/2-Inch Diameter, 50-Pack Reinforced discs to resist breakage and for long term use Cutting Wheels Works with Dremel and similar Rotary Tools Package Contains: 50 High-quality Fiber Discs Maximum Operation Speed: 26,000 RPM Super Tensile Disc for Cutting: Hard ferrous & non-ferrous metals, stainless steel, titanium, high nickel alloys, high carbon/chrome materials, etc.