Milwaukee SDS-MAX MX4 1" X 17" X 21" features the MILWAUKEE® MX4™ 4-Cutter SDS Max Rotary Hammer Drill Bits designed with solid head carbide to deliver up to five times longer life when drilling through concrete with rebar. These drill bits are engineered with rebar guards that provide maximum durability in tough aggregate and rebar conditions. The MX4™ 4-Cutter bits include sharp centering tips to ensure precise spot drilling in concrete, while the integrated 4-cutter design prevents lock-up in rebar, minimizing downtime. Optimized flutes efficiently remove dust, reduce heat buildup, and enable up to 15% more holes per battery charge. Each drill bit has a wear mark indicator to show when it no longer meets ANSI standards. These drill bits are i for concrete with rebar and masonry applications, making them a reliable choice for demanding jobs. Model Number: 48-20-3954