21/32" S&D Black Oxide Drill Bit

The Milwaukee 48-89-2743 is a 21/32" Silver & Deming (S&D) black oxide drill bit, built for heavy-duty, large-diameter drilling in metal, wood, and plastic.

This is a reduced-shank drill bit, meaning the cutting diameter is large, but the shank is 1/2" so it works in standard drill chucks.

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) – prevents slipping and fits standard drills
• Heavy-duty web construction – increases strength for large-hole drilling

Specs

• Size: 21/32 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

• Large structural bolt holes
• Steel fabrication and construction work
• Thick wood beams and framing
• HVAC, plumbing, and mechanical installs
• Any application needing large diameter holes with a standard drill

Bottom Line

The 48-89-2743 is a heavy-duty S&D drill bit, not a standard twist bit. It’s designed for big holes where strength, chip removal, and compatibility with standard 1/2" drills matter more than precision small-hole work.