DEWALT DW8211H 4-1/2-Inch by 5/8-Inch-11 Z60 T27 WB flap disc</br></br><div style="text-align:left"><b>[Product Information]</b><br><ul><li>Backing automatically wears down with cloth to allow full use of cloth increasing life by 2x's</li><li>Extended performance flap design lasts 2 times longer than std flap discs</li><li>Premium zirconia cloth prodives agressive grinding action 50 percent faster than std flap discs</li><li>Proprietary design provides removal rate of a grinding wheel with finish of a fiber resin disc</li><li>Max Rpm of 13，300</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/61A8doIKviL.jpg' noproxy></br>