The Milwaukee MX4™ 4-Cutter SDS Plus Rotary Hammer Drill Bit (1/2" x 4") is built for professional electricians and contractors who need reliable performance in concrete, rebar, and masonry applications. The 4-cutter carbide head prevents lock-up in rebar to reduce costly downtime on the job site, while variable flutes clear dust faster — delivering up to 20% more holes per battery charge. A built-in wear mark indicator takes the guesswork out of bit replacement, keeping your work ANSI-compliant. Whether you're drilling into hard aggregate, metal decking, or reinforced concrete, this bit is engineered to keep up with demanding Canadian job sites.

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