Milwaukee SDS-MAX MX4 1-1/4" X 18" X 23" features the MILWAUKEE® MX4™ 4-Cutter SDS MAX Rotary Hammer Drill Bits with solid head carbide that deliver up to five times longer life in concrete with rebar. Engineered with rebar guards, these drill bits provide maximum durability when working with hard aggregate and rebar. The MX4™ 4-Cutter bits are designed with sharp centering tips to ensure exact spot drilling in concrete. Their integrated 4-cutter design prevents lock-up in rebar, minimizing downtime. Optimized flutes enhance dust removal, reduce heat, and allow 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 MILWAUKEE® MX4™ 4-Cutter Drill Bits are i for concrete with rebar and masonry applications. Model Number: 48-20-3972