5/16" COBALT RED HELIX™ Drill Bit

The Milwaukee 48-89-2317 is a 5/16" RED HELIX™ cobalt drill bit designed for high-performance drilling in tough materials, especially stainless steel, hardened steel, and cast iron.

Key Features

• Cobalt Alloy Construction – Built for extreme heat resistance and up to 10–15× longer life vs. black oxide bits
• RED HELIX™ Variable Flute Design – Aggressive 35° entry angle transitioning to 15° for faster chip removal and reduced heat buildup
• QUADEDGE™ 135° Split Point Tip – Starts on contact and prevents walking for accurate drilling
• Enhanced Tapered Web – Strengthens the core for improved durability and reduced breakage
• 3-Flat Secure-Grip Shank – Helps prevent slipping in the drill chuck

Best Uses

• Stainless steel (primary use)
• Hardened metals and structural steel
• Cast iron
• PVC and wood (secondary use)

Bottom Line

The 48-89-2317 is a heavy-duty cobalt bit, meaning it’s built for tough, high-heat drilling jobs where standard titanium bits fail quickly. It’s commonly used in fabrication, mechanical work, and industrial applications.