About This High-Speed Steel Black Oxide Finish: The KSEIBI #575035 drill bits are crafted from premium high-speed steel with a black oxide finish, offering supreme durability and resistance against rust and corrosion, ideal for heavy-duty drilling tasks. Unique 3-Flat Shank Design: Features a 3-flat shank design to prevent slipping in the drill chuck, providing better grip and torque transfer, and enhancing drilling efficiency in various materials. Precision Step Design: Engineered with a precise step design, our bits allow for accurate drilling of multiple hole sizes (1/8" to 1/2") without the need for changing bits, optimizing your workflow and saving time. Versatile Use Across Materials: Designed for versatility, these bits are perfect for drilling clean, accurate holes in a wide range of materials including wood, metal, and plastic, making them essential for diverse projects. Ergonomic and Efficient: With their ergonomic design, these bits facilitate comfortable and efficient drilling, reducing user fatigue during extended use. Ideal for both professional craftsmen and DIY enthusiasts. Overview Material : High Speed Steel (HSS) Cutting Diameter : 0.13 Inches Finish Type : Black Oxide Shank Type : 3-Flat Cutting Angle String : 118 Degrees