Feature: Shock Resistant Screwdriver Bits- Built for high-impact high_strength screwdriving,Suitable for screwdrivers, especially impact drivers Non-slip serrated blade- Saygooibye to screwslippage Screw deep bite effectively reduces head slippage Greatly improve work efficiency Hardness62HRC-High precision optimization Material. The hardness of bit head is as high as 62HRC stronger and mofe durable Mechanics Principle Design- Strong torque,high torque After touching the screw head Impact screwdriver The resulXting collision reaction force partly absorbed by torsion Effectively prevent the cutter head from breaking Shock Proof-Qufckthrough metal Shock reststantand notcracked Easily penetrate metal plates with dovetail nails Specification: Material: D1 Alloy Steel Color: Black Condition:100% Brand new and high quality Manufacture:China,Chinese Factory Homegrown products for Sale Friendly Tips: Please allow minor error of measurement,due to manual measurement. Due to the different display and different light, the picture may not reflect the actual color of the item. Thanks for your understanding Package Included AS your choice