Bosch CO14B 14-Piece Cobalt M42 Drill Bits Set with Case

Powerful cobalt bits for hard metals

Meet the Bosch CO14B 14-Piece Cobalt M42 Drill Bit Set with Case. Built to withstand demanding metalworking tasks, these bits use an upgraded cobalt alloy to deliver enduring cutting power in tough materials like stainless steel, cast iron, and titanium. They’re designed for higher heat conditions and aim for longer life compared with standard bits, while maintaining precise starts and steady performance through multiple holes.

Key alloy and construction

The core is an upgraded M42 cobalt alloy, containing 8% cobalt. This composition enhances durability and heat resistance, helping the bits retain sharpness longer under high temperatures. When compared with standard HSS bits, cobalt variants can offer noticeably longer life in demanding jobs while maintaining accuracy in starts and hole integrity.

• Up to 10x life vs standard bits
• High-heat resistance for extended use
• Thick web-helix design for fast material removal and stability
• Surface-hardened tip for penetrating tough materials
• Split point on 1/8" and larger improves starting accuracy; 3/16" and larger uses a three-flat shank for better grip

Design details that matter on the job

The thick web-helix geometry speeds material removal while preserving stability, reducing bit wobble during heavy cuts. A surface-hardened tip helps penetrate tough surfaces. For bits 1/8" and larger, a split point improves starting accuracy, and bits 3/16" and larger use a three-flat shank for a firmer grip in your drill chuck.

What you get and how to use it

In this 14-piece set you receive sizes ranging from small pilot hole diameters to larger holes with a robust case to keep everything organized. The case is practical for workshop setups and the assortment supports a variety of metal drilling tasks across fabrication, automotive, or home projects.

• 14 cobalt M42 bits in sizes from 1/16" to 1/2"
• Split point on 1/8" and larger for easier starts
• Three-flat shank on 3/16" and larger for a secure grip
• Jobber-length bits for extended reach and control
• Case included for organization and transport