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.
• 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 50mm 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
• Type: SQ1, SQ2, SQ2.74, SQ3, SQ4, SQ5 (1 of each)
• Length: (Approx. ) 50mm
• Shank Size: 6.35mm (1/4Inch) 
• Suitable for: manual electric screwdriver, screwdriver, drill, air and other tools.
• Quantity: 6pcs set