Drill America D/A29J-CO-PC 29-Piece M42 Cobalt Drill Bit Set in Round Case | D/ACO Series

Overview

Drill America D/A29J-CO-PC 29-Piece M42 Cobalt Drill Bit Set brings professional-grade cobalt bits into a compact, round index case. The kit covers a wide range of sizes from 1/16 to 1/2 inch, in 1/64-inch increments, designed for flexibility on metalworking jobs. The set is built to handle tough materials while maintaining control and organization on the go.

• 29 M42 cobalt drill bits designed for tough materials
• Gold oxide finish provides lubrication and wear resistance
• Round shanks fit a variety of chucks and holders
• Manufactured to Aerospace Standard 907 with high red hardness

Key benefits and design features

The cobalt construction supports higher hardness materials and can help sustain sharpness under elevated drilling temperatures. The self-centering 135-degree split point reduces the need for pilot holes and produces smaller chips to minimize clogging. A gold oxide finish acts as a lubricant and adds wear resistance, while the round shanks enable compatibility with many tool holding systems.

• Self-centering 135-degree split point improves initial bite
• Smaller chips reduce debris buildup in the hole
• Extended tool life versus conventional high-speed bits
• Round drill index combines form and function for easy transport

Materials, applications, and performance

Designed to handle high-strength alloys, this set is well-suited for stainless steel, Inconel, and titanium work. The M42 cobalt composition and aerospace-grade manufacturing support higher cutting performance, while the red hardness enables capability at higher speeds compared with standard high-speed steel. This combination can be advantageous in metal fabrication, automotive components, and maintenance tasks where a reliable drill bit matters.

• High red hardness supports higher cutting speeds
• Gold oxide finish acts as a lubricant and wear barrier
• Self-centering 135-degree point reduces pilot hole needs

Carry, storage, and care

With a unique round drill index and a shatter-proof, water-resistant case, this set is designed for transport between shop and field. The case is easy to carry with one hand, and you can hang the index on a belt when hands are full. For best life, keep bits clean and dry and store in the supplied case when not in use.

• Round case fits in a truck, cabinet, or toolbox
• One-handed grip and belt-hanging capability for on-site versatility
• Compact round drill index offers portable organization