Milwaukee SDS-PLUS MX4 3/16" X 4" X 6" drill bits with solid head carbide are engineered to deliver up to five times longer life in concrete with rebar. Featuring a 4-cutter design and rebar guards, these bits provide maximum durability in tough aggregate and rebar, while preventing lock-up to reduce downtime. The sharp centering tip ensures precise spot drilling in concrete and metal decking. Variable flutes efficiently remove dust, reducing heat buildup and allowing up to 20% more holes per battery charge. A wear mark indicator signals when the bit has reached the end of its life and no longer meets ANSI standards. These MX4 4-cutter drill bits are i for demanding concrete with rebar and masonry applications. Model Number: 48-20-7311