Diablo Hammer Drill Bit Set DMARG1030 P5 3 16 Inch (5 Pack 6 Inch Length Carbide Tipped Impact Strong Hex Shank For Concrete Masonry Stone Drilling) 8" Engineered with a flush mounted reversing Engineered with a flush mounted reversing lever Multi Material Contour Cutting: Transitioning between fine wood veneers and thin structural aluminum profiles by dynamically tuning the variable speed motor dial The universal Impact Strong hex shank provides a high torque connection that prevents spinning in both corded and cordless impact drivers or hammer drills non slip plunge drilling into premium polished granite and marble facades without surface cracking