[High Quality]Heat treated, durability, has high hardness, not easy to wear. [Professional Hex Bit Set, 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. [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. [Magnetic Tips And Arbitrary choice Length]The hex Hex screwdriver set is a little bit magnetic, which helps to keep nuts and bolts stuck to them. Can improve your work efficiency. These Bits are versatile and compatible with various tools such as impact drivers, electric screwdrivers, manual screwdrivers, 1/4inch driver screwdrivers, corded drills, cordless drills, hand screwdrivers, electric drills, air drills, and more. They are suitable for a wide array of applications, including mechanical equipment, automobiles, motorcycles, bicycles, furniture, and electronic equipment, among others. Material: steel colour: black+purple Package Contents: 3 sets Strong Magnetic Bits(25/50/65/70/90/150mm)