What kind of screwdriver material is good?
The screwdriver materials are generally alloy steel and alloy are many points, are the most commonly used chrome molybdenum steel, chrome vanadium molybdenum steel, by contrast, are more expensive, but also depends on the processing technology, heat treatment is the key.
Because if the screwdriver is too hard and the screw is not nitrogen doped screw, once the screw will screw, the damage will be relatively large, ha ha
The high hardness tungsten steel is more durable but recommended high speed steel
