Specification: Shank Diameter: 1/4 inch (6.35mm) Length: 25mm, 50mm, 65mm, 70mm, 90mm, 150mm(2 each) Hardness of batch : 62HRC Product features: High hardness, High torque, Strong magnetic force, Anti slip, Wear-resistant, Non rusting Scope of use: Mechanical repair, Furniture repair, Car repair, Camera repair, Toy repair, Bicycle repair 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 slippage Greatly improve work efficiency Hardness 62HRC - High precision optimization Material. The hardness of bit is as high as 62HRC stronger and mofe Mechanics Principle Design - Strong torque,high torque After touching the screw Impact screwdriver The resulXting collision reaction force partly absorbed by torsion Effectively prevent the cutter from breaking Shock Proof - Qufckthrough metal Shock reststantand notcracked Easily penetrate metal plates with dovetail nails Material: Metal colour: As shown Package Contents: 12 x Shock Resistant Screwdriver Bits Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.