Features and Benefits: Thin .045" wheel design for fast burr free cutting; Proprietary aluminum oxide grain combination for aggressive cutting action; Proprietary material mix ensures durable long life wheels; 2 full sheets of fiberglass for durability and safety; HP Metal Cutting Wheel Type 27; Ideal for cutting in ferrous and stainless steel metals,DEWALT Type 27 HP Metal Cutting Wheels are crafted with aluminum oxide grainfor fast, aggressive cutting and extended life. A proprietary material mixensures long wheel life.