These are some practical twisted drill bits, made from high-speed steel material, safe, strong and durable for long servicing time. It effectively help you improve your work efficiency, largely save you time and efforts. With reliable performance, it can be used for iron, copper, aluminum alloy, wood and more materials. Features -Color:Golden -Material: high-speed steel. -Size:6.40X0.32X0.32cm/ 2.52X0.13X0.13inch. - Made from safe and durable high-speed steel material, sturdy and practical, these drilling bits can be used for longer period of time. - Unique twisted design, makes your drilling convenient and easy, improves working efficiency, also have good chip evacuation. - Providing greater precision and control, very proper for seasoned pros and novices alike. - Suitable for metal, wood, plastic. Also perfect for home DIY, and general building, engineering use, etc. - With detailed workmanship, convenience and high accuracy, can save of your time and efforts. Package list: drill bits