Features and Benefits:?1-3/8 in. diameter, 4-cutter head?Drilling depth 17 in.?Overall length 22 in.?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.