13/64" Thunderbolt® Black Oxide Drill Bit (12 PK)

The Milwaukee 48-89-2829 is a 13/64" Thunderbolt® black oxide drill bit set (12-pack) built for general-purpose drilling in metal, wood, and plastic.

This sits right in the mid-range of Milwaukee’s Thunderbolt jobber-length series, offering a balance between pilot-hole precision and medium fastener drilling.

Key Features

• 135° split point tip – starts on contact and prevents walking for accurate holes
• Thunderbolt reinforced web – thicker core increases strength and reduces breakage
• Black oxide coating – reduces friction and resists corrosion
• Parabolic flute design – clears chips quickly for cooler, faster drilling
• 3-flat Secure-Grip shank – prevents slipping in the chuck

These features are standard across Thunderbolt bits and are designed to improve durability and drilling efficiency across materials.

Specs

• Size: 13/64 in (0.2031")
• Quantity: 12 bits per pack
• Material: High-speed steel (HSS)
• Finish: Black oxide
• Overall length: ~3-5/8 in
• Flute length: ~2-7/16 in
• Use: Metal, wood, PVC, plastics

Best Uses

• Pilot holes for medium fasteners and bolts
• General construction and framing
• Light-to-medium metal drilling
• Woodworking and shop work
• Maintenance and repair tasks

Bottom Line

The 48-89-2829 is a mid-size, everyday Thunderbolt drill bit set—larger than small pilot bits but still squarely in the general-purpose category. It’s designed for strength, consistency, and repeated use, not specialty applications like long-reach aircraft bits or large S&D drilling.