Milwaukee MX4™ SDS-Plus 4-Cutter Rotary Hammer Drill Bits

The Ultimate Rebar-Ready Solution: Perfectly Round Holes and No-Bind Drilling in Reinforced Concrete.

When the jobsite demands drilling through reinforced concrete, standard bits just won't cut it. The Milwaukee MX4™ SDS-Plus 4-Cutter Bits are engineered to provide maximum durability and precision in the toughest environments. Featuring a unique 4-cutter head design, these bits deliver a symmetrical, perfectly round hole every time—essential for the highest-rated mechanical anchors to achieve their maximum holding power.

Unlike 2-cutter bits that can seize and snap when they encounter steel, the MX4™ is built to power through rebar without locking up, keeping you productive and protecting your tools from unnecessary wear.

Key Features & Professional Benefits:

• 4-Cutter Carbide Geometry: Provides a 4-way tip that prevents binding and locking when hitting rebar, significantly reducing the risk of tool kickback and bit breakage.
• Integrated Rebar Guards: Engineered with specialized "guards" that protect the carbide tips during incidental rebar strikes, ensuring the bit stays sharp and functional for longer.
• Precision Centering Tip: The aggressive centering point ensures immediate spot drilling without skidding, even on hard aggregate or uneven masonry surfaces.
• Perfectly Round Holes: The 4-cutter design ensures the hole is perfectly symmetrical. This is a critical requirement for safety-compliant anchoring in commercial and industrial construction.
• Wear Mark Indicator: High-contrast wear marks allow you to verify the bit still meets the ANSI tolerances required for setting anchors. When the mark disappears, it's time to replace.
• Optimized Flute Design: Features a reinforced flute geometry that clears large volumes of dust quickly while maintaining the core strength needed for high-impact drilling.

Selection Guide: The MX4™ Advantage

Use the dropdown menus above to customize your order. The MX4™ series is the professional's choice for:

• Structural Anchoring: The only way to ensure 100% surface contact for heavy-duty wedge and sleeve anchors.
• Reinforced Concrete: Designed specifically for slabs, columns, and foundations where rebar is present.
• High-Impact Durability: Built to handle the massive 2.0+ ft-lbs of impact energy delivered by M18 FUEL™ SDS-Plus hammers.

Product Specifications:

Why Invest in MX4™ 4-Cutters?

While 2-cutter bits are great for speed in standard masonry, the MX4™ is an insurance policy for your jobsite. One rebar strike with a standard bit can snap the tip and halt your progress. With MX4™ technology, you drill through the obstacle and move to the next hole without hesitation.

Drilling in standard brick or block? Check out our Milwaukee M2™ 2-Cutter Bits-Click Here for the highest drilling speeds in non-reinforced materials.