Features and Benefits:�4-Cutter Head�Highest quality carbide maximizes material pulverization�Optimized flutes provide fastest debris extraction for faster drilling�Spline shankMilwaukee®�s spline 4-cutter rotary hammer drill bits feature a 4-cutter 4 x 90° tip geometry to avoid lock up in rebar, patented rebar chamfers for increased durability, and a high volume flute for fast debris removal. Used for drilling holes in brick, block, concrete, and reinforced concrete.