Milwaukee MX4 4-Cutter SDS Max Rotary Hammer Drill Bit 9/16" x 15" x 21" 48-20-3912

REBAR-READY PRECISION FOR HIGH-CYCLE MASONRY DRILLING

When drilling deep anchors or through-holes in structural concrete, the mechanical failure of a standard bit hitting rebar isn't just an inconvenience—it’s a direct hit to jobsite productivity. These MX4™ 4-Cutter SDS Max bits are engineered with a solid head carbide that maintains structural integrity under the high-heat, high-friction environment of reinforced concrete. The integrated rebar guards act as a critical defense, preventing the head from shattering upon impact with steel, while the 4-cutter geometry ensures the bit doesn't bind, protecting the tool's internal clutch and the operator. For professionals running high-output cordless rotary hammers, the optimized flute design is a vital efficiency gain, clearing dust faster to reduce thermal load and extend the runtime per battery charge by up to 15%.

• / Solid head carbide construction delivers up to 5x longer service life in heavy-duty rebar-reinforced concrete applications.
• / Integrated rebar guards protect the bit from catastrophic failure and binding when encountering structural steel.
• / Sharp centering tip eliminates bit walk, ensuring exact spot drilling in smooth concrete or metal decking.
• / Optimized variable flutes accelerate dust extraction, reducing heat build-up and increasing holes drilled per battery charge.
• / Wear mark indicator provides a clear visual gauge to ensure holes remain within ANSI B212.15 tolerances for secure anchor installation.

WHAT'S IN THE BOX

(1) 9/16" x 15" x 21" MX4™ 4-Cutter SDS Max Rotary Hammer Drill Bit (48-20-3912)