Designed for the toughest grinding applications</br>Measures 4-1/2" x 1/4" x 7/8"</br>High performance aluminum oxide grain for long life and high material removal</br>High grain concentration for agressive grinding action and smoother running wheels</br>Proprietary material mix ensures durable long life wheels</br>3 full sheets of fiberglass for durability and safety</br>Includes five metal grinding wheels</br></br>Product Description</br></br>For use with grinders. 1/4" blade thickness?? Type 27?? A24R grit is designed for general purpose grinding of ferrous metals (steel?? iron welds?? edge grinding?? etc.)</br></br>Amazon.com</br></br>The DEWALT DW4514B5 heavy-duty 4-1/2 x 1/4-inch metal grinding wheel takes care of the toughest grinding jobs with its high performance aluminum oxide grain and three-sheet fiberglass construction. Its aggressive grain concentration (A24R grit) allows for these grinding wheels to handle heavy-duty grinding of ferrous metals (steel?? iron welds?? edges)?? weld blends?? stainless steel?? and hard alloys. DEWALT uses a proprietary material in these grinding wheels to ensure long life and consistent performance. This package includes five grinding wheels.</br><br/>http://www.amazon.com/gp/product/B000BOLH3O