Milwaukee SDS-MAX MX4 3/8" X 7" X 13" features the MILWAUKEE® MX4™ 4-Cutter SDS Max Rotary Hammer Drill Bits with solid head carbide, designed to deliver up to 5 times longer life in concrete with rebar. These bits are engineered with rebar guards to provide maximum durability when working with hard aggregate and rebar. The MX4™ 4-Cutter design includes sharp centering tips for precise spot drilling in concrete, while the integrated 4-cutter prevents lock-up in rebar, reducing downtime. Optimized flutes enhance dust removal, reducing heat build-up and allowing for up to 15% more holes per battery charge. Each drill bit also features a wear mark indicator to show when it no longer meets ANSI requirements. These drill bits are i for concrete with rebar and masonry applications, making them a reliable choice for tough jobs. Model Number: 48-20-3901