Power tools are mainly divided into metal cutting power tools, grinding power tools, assembly power tools and railway power tools. Common power tools are electric drills, electric grinders, electric wrenches and electric screwdrivers, electric hammers and impact drills, concrete shakers, electric pl
A screwdriver is a common tool used to screw in a screw, usually with a thin, wedge-shaped head that fits into a slot or notch in the head of the screw. There is mainly a word (minus sign) and a cross (plus sign). There are also common hexagon screwdrivers, including hexagon socket and hexagon socke