Bulk Packaged 20pc 1.25 inch Fiberglass Reinforced Cutoff Wheels, 1/8 inch hole. Use with 1/8 inch Screw Mandrel which is not included Max speed 15,000 rpm. A sampling showed thicknesses ranging from about 0.043 to 0.054 inches, but might vary. For use with Dremel Type Rotary Tools.