11/32" Thunderbolt® Black Oxide Drill Bit

The Milwaukee 48-89-2728 is an 11/32" Thunderbolt® black oxide drill bit designed for general-purpose drilling in metal, wood, and plastic. It’s one of the larger “standard jobber” sizes in Milwaukee’s Thunderbolt line, commonly used for heavier fastening and fabrication work.

Key Features

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

Specs

• Size: 11/32 in
• Material: High-speed steel (HSS)
• Finish: Black oxide
• Length: ~4-3/4" jobber length
• Use: Metal, wood, PVC, plastics

Best Uses

• Larger bolt and anchor holes
• Structural metal and fabrication work
• Sheet metal and light steel drilling
• Wood construction and framing
• General shop/jobsite drilling

Bottom Line

The 48-89-2728 is a standard heavy-duty “workhorse” drill bit size, not a cobalt or specialty bit. It’s meant for everyday drilling where you need a clean 11/32" hole in common construction and fabrication materials.