Toolocity CBKIT1 Monster Dry/Wet Diamond Granite/Concrete Core Drill Bits/Hole Saws， 4-Piece<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Designed for drilling granite and concrete</li><li>5/8" thread fits on polishers/ grinders</li><li>Lasting for dozens of holes depending on materials</li><li>use wet or dry</li><li>recomended speed 3000- 6000 RPM</li></ul></div><img src="http://ecx.images-amazon.com/images/I/41eIL41pHPL.jpg" noproxy>