Milwaukee SDS Plus MX4™ 4-Cutter Drill Bit Kit, 8PC features a solid head carbide design that delivers up to five times longer life when drilling through concrete with rebar. This kit is engineered with durable rebar guards to ensure maximum toughness in hard aggregate and rebar applications. The MX4™ 4-Cutter bits include sharp centering tips for precise spot drilling in concrete and metal decking, while the innovative 4-cutter design helps prevent lock-up in rebar, reducing downtime on the job. Variable flutes efficiently remove dust, decreasing heat buildup and allowing you to drill up to 20% more holes per battery charge. Each drill bit is equipped with a wear mark indicator to show when it no longer meets ANSI requirements. I for use in concrete with rebar and masonry applications, this kit is conveniently packaged in a medium, double-sided hard case compatible with the PACKOUT™ Storage System. Model Number: 48-20-7663