Features 1. High Quality: Heat treated, durability, has high hardness, not easy to wear. 2. Size: 8Pcs 50mm Metric Hex Head Allen Bit Size: 1.5mm, 2mm, 2.5mm, 3mm, 4mm, 5mm, 6mm, 8mm; 10pcs 100mm Metric Hex Head Allen Bit Size:1.5mm, 2mm, 2.5mm, 3mm, 4mm, 5mm, 6mm, 8mm, 10mm, 12mm. 3. Hex key set fit for electric drills with speed regulating device, electric screwdrivers, hand screwdrivers. Please do not use drill bits on pneumatic tools, air dills, and the electric drill without speed regulation. 4. Nickel plating surface treatment, super anti-rust. long lasting and durable. The Hex drill bit set is clearly marked that you can find what size you need quickly. Easy to take and use. 5. The hex screwdriver set is a little bit magnetic, which helps to keep nuts and bolts stuck to them. Can improve your work efficiency. Specification Material: S2 Steel Color: Silver Size: Length: 5 cm, 10 cm Weight: 155 g, 288 g Package Include: 8 Allen Screwdriver Bits or 10 Allen Screwdriver Bits