5/64" Thunderbolt® Black Oxide Drill Bit (12 PK)

The Milwaukee 48-89-2820 is a 1/16" Thunderbolt® black oxide drill bit set (12-pack) used for general-purpose drilling in metal, wood, and plastic.

It’s one of Milwaukee’s standard Thunderbolt jobber bits, meaning it’s built for everyday drilling performance and durability, not specialty applications like deep reach or large-diameter S&D bits.

Key Features

• 135° split point tip – starts on contact and reduces walking for accurate drilling
• Black oxide coating – reduces friction and improves corrosion resistance
• Thicker “Thunderbolt” web design – adds strength and reduces breakage under load
• Parabolic flute design – clears chips quickly to keep the bit cooler and cutting faster
• 3-flat Secure-Grip shank – helps prevent slipping in the drill chuck

Specs

• Size: 1/16 in
• Quantity: 12 bits per pack
• Material: High-speed steel (HSS)
• Finish: Black oxide
• Length: ~1-7/8 in jobber length
• Use: Metal, wood, PVC, plastics

Best Uses

• Pilot holes for screws and anchors
• Light metal drilling
• Woodworking and trim work
• General shop and maintenance use
• Everyday drilling where small, precise holes are needed

Bottom Line

The 48-89-2820 is a basic small-size Thunderbolt drill bit set—meant for precision pilot holes and general use, not heavy structural drilling or deep-reach work. It’s the opposite category of the big S&D and aircraft-length bits you were looking at earlier.