1/2" COBALT RED HELIX™ Drill Bit

The Milwaukee 48-89-2329 is a 1/2" RED HELIX™ cobalt drill bit made for high-performance drilling in very hard materials, especially stainless steel, hardened steel, and cast iron.

Key Features

• Cobalt Alloy Construction – Designed for extreme heat resistance and long life in hard metals (up to ~15× longer than black oxide bits)
• RED HELIX™ Variable Flute Design – Aggressive 35° helix transitions to 15° for faster chip removal and reduced heat buildup
• QUADEDGE™ 135° Split Point Tip – Starts on contact and helps prevent walking for accurate drilling
• Enhanced Tapered Web – Strengthens the bit core to reduce breakage under load
• 3-Flat Reduced Shank – Improves grip in the chuck and prevents slipping

What It’s Best For

• Stainless steel (primary use)
• Hardened steel and structural metal
• Cast iron
• Heavy fabrication and industrial drilling