Features : *Heat treated, durability, has high hardness, not easy to wear. *Professional Hex Bit Set Are Made of S 2 Alloy Steel, Very Well Made And Tough As Nails.Hardness can reach HRC62 degree. *Hex key 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. A long lifetime of the drill bit is reached due to its construction and superior technology. *Nickel Plating Treatment, Super Anti-Rust。High quality, long lasting and . The Hex drill bit set is clearly marked that you can find what size you need quickly. *Easy to take and use. *The hex screwdriver set is a little bit magnetic, which helps to keep nuts and bolts stuck to them. Can improve your work efficiency. Specifications: Material: S 2 alloy steel Color: black Batch head diameter: 5.5mm Length: 25mm,50mm,65mm,70mm,90mm,150mm Colour: black, yellow Main Product: Cross Impact Screwdriver Bits Package Included: Package1#: 1 × Screwdriver Bit Package2#: 6 × Screwdriver Bits（25mm,50mm,65mm,70mm,90mm,150mm each 1pcs) Note: 1. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. 2. Please allow slight manual measurement deviation for the data. Made of high quality material, durable and practical to use. Perfect functions,give you a wonderful experience. Every customer can enjoy 30 days refund or replacement for Damaged/Quality Issues. If you have any questions, please feel free to contact us, we will solve it for you. Electric Screwdriver 25-150Mm Impact Strong Magnetic Batch Head Hand Cross Drill