**Simpson Strong-Tie MDMX08121Q SDS-Max Quad Carbide Bit 13/16" x 17" x 21" – Heavy-Duty Masonry Drill Bit for Concrete, Brick & Stone – Perfect for Construction, Renovation & DIY Projects**

Heavy-duty Simpson carbide-tipped drill bits are premium quality, professional grade, manufactured by german engineers to the highest industry standards. They are design to meet precise tolerance requirements and incorporate proprietary features that enhance durability, drilling speed and usability. Regular and quad head bit and solid-tipped tip configurations are available. Shank styles include SDS-Plus, SDS-Max, Spline and Straight. Drill bits conform to ANSI Standard B212.15.