Features: *The accuracy and durability of this kit meets higher standards. Use them for DIY home projects or work sites. *With magnetic, the parts adopt strong permanent magnet, which can fix the screws firmly. Perfect placement every time. *Standard shank diameter, 6.35mm on the opposite side of the hexagonal shank, 1/4 standard shank diameter, suitable for all kinds of pneumatic screwdrivers, electric screwdrivers, and rechargeable screwdrivers. *Straight and concentric angles can effectively reduce the phenomenon of bit swinging. *Made of sturdy alloy steel, high hardness, strong torsion, long-term use. *Upgraded anti-rust and better storage, the surface adopts special anti-rust surface treatment. Specifications: Product name: Screwdriver Bits Material: Steel Color: Grey Length: 200mm / 7.78Inch Head: Torx Shank: 1/4 Inch Hex Magnetic: Yes With Hole: Yes Size: T8, T10, T15, T20, T25, T27, T30, T40 Suitable for: electric drills with speed regulating device, electric screwdrivers, hand screwdrivers Quantity: 8Pcs/Set Package Includes: 8 × Torx Screwdriver Bits Notes: 1.Transition: 1cm=10mm=0.39inch. 2. 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. 3. Please allow slight manual measurement deviation for the data.