Cobalt steel bits are drill bits made from a high-speed steel alloy that contains cobalt. This addition enhances their hardness and heat resistance, making them suitable for drilling into tough materials like stainless steel and other hard metals. They are known for their durability and ability to maintain sharpness over extended use. These bits are often used in industrial applications, as well as by DIY enthusiasts for metalworking projects. Cobalt steel bits come in various sizes and shapes, allowing for versatility in drilling tasks. Proper use and maintenance can significantly extend their lifespan and performance.