Gyros ST 11-41502 Fiberglass Reinforced Cut Off Wheel, 1-1/2-Inch, 2-Pack Reinforced discs to resist breakage and for long term use Cutting Wheels Works with Dremel and similar Rotary Tools Package Contains: 2 Quality Fiber Discs and 2 Washers Maximum Operation Speed: 45,000 RPM Super Tensile Disc for Cutting: Hard ferrous & non-ferrous metals, stainless steel, titanium, high nickel alloys, high carbon/chrome materials, etc.