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Features: 1. 【High Quality】-Heat treated, durability, has high hardness, not easy to wear. 2. 【Professional Hex Bit Set Are Made of S2 Alloy Steel, Very Well Made And Tough As Nails】-Hardness can reach HRC60 degree. 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. A long lifetime of the drill bit is reached due to its durable construction and superior technology. 3. 【Nickel Plating Surface Treatment, Super Anti-Rust】-High quality, 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. 4. 【Magnetic Tips And Arbitrary choice Length】 -The hex allen screwdriver set is a little bit magnetic, which helps to keep nuts and bolts stuck to them. Can improve your work efficiency. Thumbs up! 5.【360-degree tight fit】: Say goodbye to screw slipping from now on, and 360-degree tight fit. Specifications: Material: S2 alloy steel Color: black Color: 1/4 inch hexagon (6.35mm) 1. High toughness and strength 2. Provide a tighter fit and less bulge 3. Suitable for manual and electric shock drivers Package Included: 1 * Cross screwdriver bit