What material is suitable for the screwdriver head?
A good screwdriver should be hard and not crisp, tough and tough. When the screw head opening bald slip can use hammer screwdriver to screw the tick groove deep, easy to screw, the screwdriver to unscathed; screwdriver is often used to pry things, requires a certain toughness without bending will not break. In general, I hope the head of the screwdriver is more than HRC60 in hardness, and it is not easy to rust.
The head of a quality screwdriver is made of spring steel of relatively high hardness.
