Best Cobalt Long Drill Bits of 2026

Greycore Cobalt Extension Bit is a set of two 1/8 Inch x 6 Inch drill bits made of M35 cobalt with a titanium coating. These heavy-duty bits are designed for durability and fast penetration through various materials. The 135-degree split point tip prevents slipping, increases drilling speed, and ensures smooth penetration. Ideal for hard metals, stainless steel, wood, and more, these bits are versatile for repair, construction, and woodworking projects.

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.

The Drill America Cobalt Drill Bit is designed to handle tough materials like stainless steel, inconel, and titanium, making it a reliable choice when you need to drill through strong metals. Its 135° split point tip helps you start drilling precisely by preventing the bit from slipping or walking on the surface. The round shank design means you can easily use this bit with many different tool holders, adding to its versatility. Plus, the gold oxide coating, although thin, protects the bit’s surface and performs similarly to uncoated tools, ensuring durability during your projects.

Drill America Cobalt Drill Bit is perfect for drilling tough materials like stainless steel, inconel, and titanium. Its 135° split point tip prevents the drill from moving around. The round shanks allow compatibility with various tool holding systems. The gold oxide coating identifies the cobalt steel tool and offers performance similar to uncoated tools. With a 6" overall length, it provides extra reach for drilling needs.

The HLOFIZI Cobalt Long Bits set includes six 1/8-inch by 6-inch drill bits perfect for drilling into tough materials like hardwood, plastic, aluminum, and soft metals. Made from durable M35 cobalt high-speed steel, these bits resist breaking and last longer, saving you time and money. Their premium coating helps them handle high heat and protects against rust, keeping them reliable over many uses. Plus, the sharp 135-degree split point design ensures your drill starts precisely without slipping, making your work cleaner and easier.

The SALI Cobalt Drill Bits provide precise drilling with a 1/16" cutting diameter and a 6" length, allowing you to handle detailed jobs easily. Their black oxide coating not only extends the life of the bits by about 50% but also balances toughness and hardness, so you get durable tools that resist wear. This coating also helps keep the drill bits cool by holding coolant near the cutting edge, which improves performance. These bits are versatile, making it simple for you to drill through tough materials like sheet metal, stainless steel, aluminum, and copper, perfect for various DIY or professional projects.

The Milwaukee Red Helix Bits set includes 23 pieces designed for long drilling tasks. These drill bits are made with cobalt, which makes them durable and able to handle tough materials like metal. The red helix design helps remove debris efficiently, so you can drill smoothly without interruptions. This set is perfect if you need reliable, long drill bits that can tackle challenging jobs and last through heavy use. With this set, you get a variety of sizes to fit your specific drilling needs, making your work easier and more precise.

Drill America Cobalt Bit is designed to tackle tough materials like stainless steel, inconel, and titanium. Its 135° split point tip prevents the drill from wandering off course, ensuring precision. The round shanks allow compatibility with various tool holding systems. The gold oxide surface treatment distinguishes it as cobalt steel, offering performance similar to uncoated tools. With a 6" length, it provides the extra reach needed for drilling tasks.

The HLOFIZI Cobalt Drill Bit is designed to handle tough materials like hard metal, stainless steel, and cast iron with ease. Its M42 high-speed steel with 8% cobalt content makes it extremely durable and resistant to breaking, so you can rely on it for long-lasting use. The titanium coating helps the bit withstand high temperatures and prevents rust, keeping it in great shape even after heavy use. Plus, the 135-degree split point design ensures your drilling starts precisely without slipping, giving you clean, accurate holes every time. This bit is a great choice if you want efficiency and reliability in your drilling tasks.

The Drill America Cobalt Drill Bit is designed to help you drill through tough materials like stainless steel, inconel, and titanium with ease. Its 135° split point tip keeps the drill steady, preventing it from slipping or wandering as you work. The round shank design makes it compatible with many different tool holders, giving you flexibility in how you use it. Plus, the gold oxide coating, while thin, offers a protective surface similar to uncoated tools, helping maintain durability during your drilling projects.