19/64" Thunderbolt® Black Oxide Drill Bit

The Milwaukee 48-89-2725 is a 19/64" Thunderbolt® black oxide drill bit used for general-purpose drilling in wood, metal, and plastic. It’s part of Milwaukee’s standard jobber-length “workhorse” drill bit line.

Key Features

• Black oxide coating – reduces friction and improves corrosion resistance
• 135° split point tip – starts on contact and helps prevent walking for accurate holes
• Thunderbolt web (thicker core) – increases strength and reduces breakage under side load
• Parabolic flute design – clears chips quickly to reduce heat and improve drilling speed
• 3-flat secure-grip shank – helps prevent slipping in the drill chuck

Specs

• Size: 19/64 in (0.2969")
• Material: High-speed steel (HSS)
• Finish: Black oxide
• Length: ~4-3/8" jobber length
• Use: Metal, wood, PVC, plastic

Best Uses

• Medium-large bolt and anchor holes
• General construction and fabrication drilling
• Sheet metal and light steel
• Wood framing and assembly work
• Everyday shop use

Bottom Line

The 48-89-2725 is a standard larger-size general-purpose drill bit, not a specialty cobalt or impact-rated bit. It’s built for reliable, everyday drilling where you need a clean 19/64" hole across common materials.