These drill bits are crafted from cobalt high-speed steel, which contains a significant percentage of cobalt. This enhances the bit's hardness, heat resistance, and durability., Yato Cobalt Twist Drill Bits are versatile and can be used for drilling into various materials, including metal, wood, plastics, and composites., These drill bits are suitable for use with various drilling equipment, including hand drills, drill presses, and cordless drills.