Description Features: *Made of Steel material, overall heat treatment, hardness HRC 58 2, large torque, good toughness. *The surface is bluish, and it is resistant to rust. *Powerful Function: Strong magnetic,can suck the screws easily when used it. *Wide Using Application: Can be used for manual electric screwdriver, screwdriver, drill, air and other tools. *Exquisite workmanship, each edge can be accurately locked screws, no damage to the screw, and the screwdriver head. *Professional multi size package, hexagonal handle on 65mm length. Use different sizes to screw, will damage screwdriver and the screw Using the correct screwdriver bar, pay the less effort, and can easily unscrew the screws Specification: Product Name: Square Head Screwdriver Bit Material: Alloy Steel Color: Grey Optional Type: SQ1, SQ2, SQ2.74, SQ3, SQ4, SQ5 Optional Length: (Approx. ) 50mm / 65mm Shank Size: 6.35mm (1/4Inch) Suitable for: manual electric screwdriver, screwdriver, drill, air and other tools. Quantity: 10pcs Package Included: 10 Square Head Screwdriver Bits Note: 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.Made of high quality material, durable and practical to use.