A screwdriver is a common tool used to turn a screw into place. It usually has a thin wedge-shaped head that can be inserted into a slot or recess in the screw head.
Beijing-Tianjin-Jin-Jin and Shaanxi and northern Shaanxi and northern Henan are called "screwdrivers". Northern Henan is more commonly called a screwdriver. Jiangxi, Anhui, and Hubei, south of the Yellow River in Henan, and Shaanxi Guan are called "drivers" , The Midwest region is called "change sword".
There are mainly two types: a word (minus sign) and a cross (positive sign). Hexagonal screwdrivers are also common, including two types of inner hex and outer hex.