Milwaukee SDS-PLUS MX4 3/4" X 10" X 12" drill bits with solid head carbide are designed to deliver exceptional durability and performance, ing up to 5 times longer life when drilling through concrete with rebar. These drill bits feature a 4-cutter design with engineered rebar guards that prevent lock-up and reduce downtime, making them i for tough masonry applications. The sharp centering tip ensures precise spot drilling in both concrete and metal decking, while variable flutes efficiently remove dust to reduce heat buildup and extend battery life by delivering up to 20% more holes per charge. A wear mark indicator signals when the bit reaches the end of its useful life and no longer meets ANSI standards, ensuring reliable and consistent results on every job. Model Number: 48-20-7215