1. This step drill for metal drilling is an indispensable tool for achieving efficient and professional piercing. Featuring a titanium surface coating, this step drill bit ensures precise cutting and centering without deviation. The HSSTIN drill bit offers wear resistance and hardness. Designed for faster drilling progress, it is ready for your use. 2. Dimensions: 5 diameter steps (4.0, 6.0, 8.0, 10.0, 12.0 mm). Bit length: 65 mm. Working part length: 41 mm. Item weight: 17 g. Material: Steel. Surface coating: Titanium nitride, ensuring longterm durability. Hex shank: 1/4 inch. Designed to minimize vibration during operation. 3. Key advantage: The twist drill features a selfcentering tip for quick penetration into metal, reducing slippage risks. Made from strength steel (HSS), it enables faster drilling. Suitable for various materials, including nonferrous metals, plexiglass, plastic, and sheet metal. This bit delivers drilling precision, tested and approved by professionals over time. Warning: Metal drilling produces chips; safety glasses and work gloves are recommended. The step drill is engineered to enhance drilling efficiency. With a long service life, it is solid, robust, and effective. Ideal for mechanics and construction work, this drill bit guarantees extended durability.