Why Screwdrivers Have No Round Head?

A screwdriver, a tool used to turn a screw to force it into place, usually has a thin wedge head that can be inserted into a slot or notch in a screw head.

No screwdriver head, because the round head did not twist. The word is to ensure that there is a twist, while the cross can make the power distribution more evenly.

According to the power source to have a manual screwdriver and electric screwdriver; according to the first or the cutter head to divide the word (flathead) and Phillips (phillips).

High-quality screwdriver head is made of relatively high hardness spring steel.

A good screwdriver should be hard but not brittle, hard and have a tail. When the screw head opening bald slipping slippery hammer hammer can be used to strike the screw slot tick ticking deeper, easy to unscrew the screwdriver unscathed; screwdrivers are often used to pry things, it requires a certain degree of toughness Bend not fold. Overall hope that the head of the screwdriver hardness greater than HRC60, not easy to rust.

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