Made of high-speed steel, these drill bits are very durable and practical, can support long time of using. Widely applied for metal, aluminum, wood, plastic and more materials. Not easy to corrosion or rust, it can easily improve your work efficiency and give you relaxed way of drilling. Features -Color:Golden -Material: high-speed steel. -Size:6.40X0.32X0.32cm/ 2.52X0.13X0.13inch. - Using high-speed steel materials, these drill bits are durable, safe and practical, low cutting resistance. - The impact driver bit set maintains a secure connection, helps minimize drops and reduces wobble. - High hardness and wear resistance, can provide accurate positioning and high efficiency to drill better. - Precision angled inserts help ensure fast drilling, good cutting forces and excellent chip evacuation. - These professional drill bits can be widely used for metal, wood, plastic, and more. Package list: 10 x drill bits