Features and Benefits:4-Cutter HeadHighest quality carbide maximizes material pulverizationOptimized flutes provide fastest debris extraction for faster drillingSpline 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.