1-1/4" S&D Black Oxide Drill Bit

The Milwaukee 48-89-2758 is a 1-1/4" Silver & Deming (S&D) black oxide drill bit, and it is the largest bit in the 48-89-27xx series you’ve been working through.

It’s designed for very large, heavy-duty drilling applications in metal, wood, and plastic, while still fitting a standard drill thanks to its 1/2" reduced shank.

Key Features

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

Specs

• Size: 1-1/4 in (1.25")
• 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

• Oversized structural bolt holes
• Steel fabrication and heavy construction
• Thick timber / beam drilling
• HVAC, plumbing, and mechanical installs
• Any job requiring maximum hole size with a standard drill

Bottom Line

The 48-89-2758 is essentially the maximum-size “standard drill-compatible” bit in this Milwaukee S&D lineup. It’s built for industrial-scale hole drilling, where strength, chip clearing, and chuck compatibility matter more than precision or speed.