Milwaukee MX4 4-Cutter SDS Max Rotary Hammer Drill Bit 1/2" x 21" 48-20-3902

ELIMINATE BINDING IN REINFORCED CONCRETE AND HARD AGGREGATE

When you're drilling deep into structural concrete for bridge decks or foundation anchors, hitting rebar is the ultimate progress killer. These MILWAUKEE® MX4™ 4-Cutter SDS Max bits are engineered for the extreme torque and impact energy of heavy-duty rotary hammers. Featuring a solid carbide head design, these bits don't just survive rebar strikes—they power through them with up to 5x more life than standard bits. The integrated 4-cutter geometry prevents the bit from seizing and locking up when encountering steel reinforcement, protecting both the operator and the tool's internal clutch from violent kickbacks. Optimized flutes clear heavy dust loads rapidly to reduce thermal buildup, ensuring you get maximum runtime out of your MX FUEL™ or M18 FUEL™ high-output batteries on the most demanding civil infrastructure jobsites.

• / Solid Head Carbide: Engineered to withstand high-impact rebar strikes and hard aggregate for 5x longer service life.
• / Anti-Lock 4-Cutter Geometry: Prevents the bit from binding in rebar, reducing downtime and protecting the tool's transmission.
• / Wear Mark Indicator: Provides a visual reference to ensure the bit still meets ANSI B212.15 requirements for critical anchor placement.
• / Sharp Centering Tip: Enables exact spot drilling on concrete and metal decking, preventing bit walk during initial penetration.
• / Optimized Flute Design: Removes dust efficiently to reduce heat and deliver up to 15% more holes per battery charge.

WHAT'S IN THE BOX

(1) MX4™ 4-Cutter SDS Max Rotary Hammer Drill Bit 1/2" x 15-1/2" x 21" (48-20-3902)