This is a professional 7 pcs drill bit set. Industrial grade high-speed steel for higher durability and sturdiness. Suitable for drilling in tough material, including aluminium, cast iron, brass, copper, magnesium alloy, plastics, etc. Feature - Color: Silver - Material: - Bit diameter: 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 10mm - High-speed steel with coating treatment, tougher and more abrasion resistant for longer working life and high work efficiency. - Solid and easy to use. - Round design drill bits, accurate and fine, increase drilling speed. - Mainly for drilling wood, plastic, fiberglass, printed circuit board, and metal including copper, aluminum, tool steel, cast iron, and heavy-duty abrasive alloy metal, etc. - for home DIY, building and engineering use etc. Package list: 7 x drill bits 1 x wrench