17/64" Thunderbolt® Black Oxide Drill Bit

The Milwaukee 48-89-2723 is a 17/64" Thunderbolt® black oxide drill bit used for general-purpose drilling in metal, wood, and plastic, and it’s part of Milwaukee’s standard jobber-length drill bit lineup.

Key Features

• Black Oxide Coating – Reduces friction and provides corrosion resistance for longer bit life
• 135° Split Point Tip – Starts on contact and helps prevent walking for accurate holes
• Thunderbolt Web Design – Thicker core improves strength and reduces breakage under side load
• Parabolic Flutes – Clears chips quickly to reduce heat and improve drilling speed
• 3-Flat Secure-Grip Shank – Helps prevent slipping in the drill chuck and improves torque transfer

Specs (typical)

• Size: 17/64 in
• Material: High-speed steel (HSS)
• Finish: Black oxide
• Use: Metal, wood, PVC, plastics
• Length: Jobber length (~4-1/8")

Best Uses

• Medium-large bolt and anchor holes
• General metal drilling (sheet metal, brackets, light steel)
• Wood framing and construction
• Plastic and PVC fabrication
• Everyday shop and jobsite work

Bottom Line

The 48-89-2723 is a standard larger-size “workhorse” drill bit in the Thunderbolt black oxide line. It’s not a specialty cobalt or titanium bit—it’s meant for reliable everyday drilling where you need a clean, accurate 17/64" hole in common materials.