MAXIMUM CHIP EJECTION FOR LARGE-DIAMETER METAL BORING

Engineered for the mechanical demands of high-tensile materials, the Milwaukee Thunderbolt® Silver & Deming drill bit represents a significant upgrade in boring efficiency for stainless steel and cast iron. The specialized parabolic flute geometry is the core of this bit's performance, aggressively clearing chips to mitigate heat friction—the primary killer of large-diameter bits. By utilizing a heavy-duty Thunderbolt core, this bit maintains structural integrity under high-torque loads, ensuring that the 7/8" diameter remains true even through deep-hole applications. For the professional looking for long-term ROI, the black oxide coating provides the necessary lubricity to prevent galling while offering a robust defense against jobsite corrosion.

• / 135° Split Point Tip: Starts on contact to eliminate bit walking and ensures immediate penetration in stainless steel and high-tensile alloys.
• / 3-Flat Secure-Grip™ Shank: Specifically engineered with milled flats to prevent the bit from spinning in the chuck during high-torque drilling.
• / Parabolic Flute Geometry: Rapidly ejects chips and debris to keep the cutting edge cool and extend the service life of the bit.
• / 1/2" Reduced Shank: Allows for the use of large-diameter 7/8" bits in standard 1/2" drill chucks for maximum jobsite versatility.

WHAT'S IN THE BOX

(1) 7/8" Thunderbolt Silver & Deming Drill Bit (48-89-2756)