5/16 in. Cobalt Red Helix Twist Drill Bit

This Milwaukee RED HELIX Thunderbolt cobalt twist drill bit is built for hard metals with a variable helix design and QuadEdge tip for cooler, faster drilling. A thicker tapered web and 3-Flat Secure-Grip shank enhance strength and reduce slippage for precise, long-lasting performance.

Key Features:

• Durable Cobalt Construction: Up to 15x life vs. black oxide bits in hard metals
• QuadEdge Tip: Reduces heat buildup and speeds drilling with a 135° split point for no walking
• Variable Helix Design: 35°–15° fluted geometry for rapid material removal
• Enhanced Tapered Web: Strengthens the core to resist breakage
• 3-Flat Secure-Grip Shank: Keeps the bit firmly seated in the chuck

Specifications Table:

Frequently Asked Questions (FAQ):

Q: What materials can this bit drill?
A: Designed for hard metals and also works on stainless steel, cast iron, duct/sheet metal, aluminum, PVC, wood, and steel.

Q: What is the bit length and diameter?
A: Diameter is 5/16 in. and overall bit length is 4.5 in.

Q: Will the tip wander when starting a hole?
A: The 135° split point provides a precision start that helps prevent walking.

Q: What shank style does it use?
A: It has a 3-Flat Secure-Grip shank to reduce slippage in the chuck.

Q: Is this sold as a single bit?
A: Yes, it is an individual 1-piece bit.

Precision Meets Power in Hard Metal

With its warm cobalt sheen and sculpted helix, this drill bit brings refined strength to any workshop. The QuadEdge tip and tapered web elevate performance, turning demanding metalwork into clean, confident cuts. Pair it with a sleek cordless driver and a brushed steel surface for a modern, professional vignette. It’s a small but essential luxury—engineered beauty that works as hard as you do.

Choose Milwaukee’s Thunderbolt Cobalt bit for faster, longer-lasting drilling in hard metals—add it to your toolkit today.

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