Milwaukee SDS-MAX MX4 1" X 8" X 13" drill bits are engineered for superior performance and durability in concrete with rebar and masonry applications. These MX4 4-Cutter SDS Max Rotary Hammer Drill Bits feature solid head carbide that delivers up to five times longer life d to standard bits. Designed with rebar guards, they provide maximum durability when working with hard aggregate and rebar. The sharp centering tips ensure precise spot drilling in concrete, while the integrated 4-cutter design prevents lock-up in rebar, minimizing downtime. Optimized flutes efficiently remove dust, reducing heat buildup and enabling 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, helping you maintain high-quality performance on the job. Model Number: 48-20-3952