Best Cobalt Long Drill Bits of 2025

Introducing the Drill America Cobalt Aircraft Extension Drill Bit, a powerful tool designed to tackle tough drilling tasks. With its high tensile strength, this drill bit is perfect for materials like stainless steel, inconel, and titanium. The 135° split point tip ensures that the drill stays on track, preventing it from wandering off course. The round shanks allow for easy compatibility with various tool holding systems, making it versatile and convenient to use. The gold oxide surface treatment not only adds a touch of style but also enhances performance, making it comparable to uncoated tools. Plus, with its 12" overall length, this drill bit provides the extra reach you need for those hard-to-reach drilling areas. Upgrade your drill set with the Drill America Cobalt Aircraft Extension Drill Bit and experience the power and precision it delivers.

Drill America Bit is a high-quality cobalt aircraft extension drill bit designed for drilling tough materials like stainless steel, inconel, and titanium. Its 135° split point tip prevents the drill from wandering off course, ensuring precise drilling. The round shanks make it compatible with various tool holding systems, offering versatility. The gold oxide surface treatment distinguishes it as a cobalt steel tool with performance similar to uncoated tools. With a 6" overall length, it provides extra reach for drilling in hard-to-access areas.

The SALI Cobalt Drill Bits are designed for precision and durability. With a cutting diameter of 1/8" and a length of 12", these bits are perfect for various drilling tasks. Their black oxide coating not only extends their lifespan but also improves toughness and wear resistance, making them reliable for tough materials. You will appreciate the enhanced lubricity provided by the black oxide treatment, which helps keep the bits cool during use. Additionally, the right-hand cut design effectively removes chips, ensuring a smooth drilling experience without clogging.

The Greycore Cobalt Drill Bits are built for exceptional durability and performance. Made with M35 cobalt and a titanium coating, these bits resist wear and heat, making them ideal for tough tasks. The 135-degree split point tip enhances drilling speed and reduces slipping, allowing you to work more efficiently. You’ll find these bits versatile, as they can easily penetrate various materials like steel, cast iron, and wood. Whether you’re involved in construction, repair, or woodworking, these drill bits provide the reliability and effectiveness you need to get the job done right.

The BOSCH CO2148 Cobalt Drill Bit is a long-lasting solution for high-temperature applications. Its rigid and thick web design provides stability in tough situations, while its surface is hardened for penetration of abrasive materials. This drill bit is ideal for drilling into various metals, including high-carbon steel, stainless steel, aluminum and cast iron.

HHIP Cobalt Tool Bit is a high-quality tool suitable for heavy cuts in hard materials, thanks to its 5% Cobalt Superior High-Speed Steel construction. The extra-long 6-inch size ensures versatility in various applications. With dimensions of 17.1 H x 1.7 L x 3.4 W (centimetres), it offers ease of handling and storage. Weighing only 0.145 kilograms, it is lightweight for extended use without causing fatigue.

The Drill America Cobalt Bit is designed for drilling tough materials such as stainless steel, inconel, and titanium. Its 135° split point tip helps prevent the drill from wandering, ensuring precise holes every time you work. The round shank design allows you to use the bit with various tool holding systems, providing versatility in your projects. Additionally, the bit features a 6-inch length, making it ideal for reaching deeper areas where standard bits may not suffice. With these attributes, you can tackle challenging tasks with confidence and ease.

The Dormer Extra Long Drill Bit is designed for deeper drilling with its extended flutes, making it ideal for reaching tough spots. The 130-degree point angle helps you achieve precise centering, which minimizes pressure on the cutting edges, enhancing durability. Made from high-speed steel with cobalt, this bit offers a tough and hard solution for drilling through hard materials. Additionally, the uncoated bright finish, featuring a Smooth-Flow coating, helps reduce friction, improve chip removal, and prolong the life of the tool, ensuring you get the most out of your investment.

The Cleveland Cobalt Drill Bit is designed for those who need a reliable tool for drilling through tough materials. Its high-speed steel construction with cobalt offers a strong balance of durability and hardness, ensuring effective performance. The long length gives you extra reach for deeper holes, making it perfect for various projects. The notched point, angled at 118 degrees, allows for easier penetration and minimizes the risk of the bit walking during use. Additionally, the gold oxide finish helps reduce grinding stress, enhancing the tool's longevity and efficiency.

The Toolbits Cobalt Tool Bit is designed with a 3/8" square size and a length of 3 inches, making it ideal for a variety of drilling applications. Made from high-speed steel with a 5% cobalt content, these tool bits can withstand higher temperatures compared to standard M2 high-speed bits. This means you can work on tougher materials without worrying about wear and tear. The durable construction ensures that you get consistent performance, giving you the confidence to tackle challenging tasks. With a pack of four, you’ll have plenty of bits on hand for all your projects.