DEWALT DW4961 4-Inch by 2-Inch by 5/8-Inch -11 Concrete/Masonry Grinding Steel Backed Cup Wheel</br></br><div style="text-align:left"><b>[Product Information]</b><br><ul><li>Aluminum oxide and silicon carbide grain for long life and high material removal</li><li>Type 11 shape for maximum surface grinding coverage</li><li>Metal backing for greater durability</li><li>Proprietary material mix for agressive grinding action</li></ul></div></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br><img src='http://ecx.images-amazon.com/images/I/61QLt4PQWpL.jpg' noproxy></br>