Milwaukee SDS-PLUS MX4 3/16" X 2" X 4" drill bits with solid head carbide are designed to deliver up to 5 times longer life in concrete with rebar. Featuring a 4-cutter design and engineered rebar guards, these bits provide maximum durability in tough materials 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, reduce heat buildup, and enable up to 20% more holes per battery charge. A wear mark indicator signals when the bit reaches the end of its life and no longer meets ANSI standards. I for concrete with rebar and masonry applications, these Milwaukee MX4 drill bits combine durability and performance for demanding jobs. Model Number: 48-20-7310