7/32" Thunderbolt® Black Oxide Drill Bit

Milwaukee 48-89-2720 — Product Description

The Milwaukee 48-89-2720 is a 7/32" Thunderbolt® black oxide drill bit designed for general-purpose drilling in metal, wood, and plastic, commonly used for medium-sized holes and light fabrication work.

Key Features

• Black Oxide Coating – Reduces friction and helps resist corrosion for longer tool life
• 135° Split Point Tip – Starts on contact and reduces walking for accurate hole placement
• Thunderbolt Web Design – Thicker core improves strength and reduces breakage under side load
• Parabolic Flute Design – Clears chips quickly to keep drilling cooler and faster
• 3-Flat Secure-Grip Shank – Helps prevent slipping in the drill chuck and improves torque transfer

Specs (typical)

• Size: 7/32 in
• Material: High-speed steel (HSS)
• Finish: Black oxide
• Length: Jobber length
• Use: Metal, wood, PVC, plastics

Best Uses

• Medium pilot holes for bolts and anchors
• General metal drilling (sheet metal, brackets, light steel)
• Wood framing and construction work
• Plastic and PVC fabrication
• Everyday shop and jobsite drilling

Bottom Line

The 48-89-2720 is a standard “workhorse” drill bit size in Milwaukee’s Thunderbolt black oxide line. It’s not a specialty bit—it’s designed for reliable everyday drilling where strength, accuracy, and chip clearing matter more than extreme hardness capability.