7/8" S&D Black Oxide Drill Bit

The Milwaukee 48-89-2750 is a 7/8" Silver & Deming (S&D) black oxide drill bit, designed for very large, heavy-duty drilling applications in metal, wood, and plastic.

This is the largest size in the 48-89-27xx series you’ve been going through, and it belongs to Milwaukee’s reduced-shank (S&D) lineup, meaning it still fits a standard 1/2" drill chuck.

Key Features

• 135° split point tip – starts on contact and prevents walking for accurate drilling
• Black oxide coating – reduces friction and improves corrosion resistance
• Parabolic flute design – clears chips quickly for faster, cooler drilling
• 1/2" reduced shank (3-flat Secure-Grip) – fits standard drill chucks securely
• Heavy-duty web construction – adds strength for large hole drilling
  

Specs

• Size: 7/8 in
• Shank: 1/2" reduced (S&D style)
• Material: High-speed steel (HSS)
• Finish: Black oxide
• Overall length: ~6 in
• Use: Metal, wood, PVC, plastics
  

Best Uses

• Very large structural bolt holes
• Steel fabrication and construction work
• Thick timber / beam drilling
• HVAC, plumbing, and mechanical installs
• Heavy-duty jobsite drilling where maximum diameter is needed

Bottom Line

The 48-89-2750 is a heavy-duty S&D drill bit for maximum-size holes, not a standard twist drill. It’s designed so a normal drill can still handle industrial-sized diameters safely and efficiently thanks to the reduced shank design.