Made from high-speed steel, durable and practical, with fine craftsmanship details, withstand long period of using. Widely applied for metal, aluminum, wood, plastic and more materials. It can easily improve your work efficiency and give you relaxed way of drilling. Easy to use and take to any places you need. Features - Color: black. - Material: high-speed steel. - Size: 13.00X1.00X1.00cm/ 5.11X0.39X0.39inch. - Specifications: 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, 10mm. - High-speed steel materials, durable, safe and practical, low cutting resistance, these drill bits are very professional. - Terrific workmanship, excellent working performance, fast execution, can better maintain strength and efficiency. - High hardness and wear resistance, can offer accurate positioning and high efficiency to drill better. - Small size, take up almost no space, convenient for storage, bringing you satisfying using feeling. - Reasonable twisted structure, efficient and practical, can easily help you finish your work and improve efficiency. Package list: 19 x drill bits