Milwaukee SDS-MAX MX4 1-3/8" X 18" X 23" features MILWAUKEE® MX4™ 4-Cutter SDS Max Rotary Hammer Drill Bits with solid head carbide that deliver up to five times longer life when drilling into concrete with rebar. These bits are engineered with rebar guards to ensure maximum durability when working with hard aggregate and rebar. Designed with sharp centering tips, the MX4™ 4-Cutter bits provide precise spot drilling in concrete. The integrated four-cutter design prevents lock-up in rebar, reducing downtime and increasing efficiency. Optimized flutes help remove dust faster, reducing heat buildup and allowing up to 15% more holes per battery charge. Each drill bit includes a wear mark indicator to show when it no longer meets ANSI requirements. These drill bits are i for use in concrete with rebar and masonry applications, making them a reliable choice for demanding jobs. Model Number: 48-20-3980