• The material:alloy steel
• With spring inside:the special design convert downward impact to transverse vibration which can protect head from broken.
• Two times impact resistance ability than normal bit.
• Phillips double cross head size:PH2
• Features: impact resistance,shockproof driver bits.
• Hex Shank:1/4 inch (6.35mm)
• Hex shank lengh:110mm
• It obtain the high hardness and high torque to be more durable after whole body heat treatment,wear resistance.
• Standard:QB/T 4205-4209-2011
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