Steel shield 7-piece two-color insulated screwdriver set A screwdriver is a tool used to turn a screw to force it into place. It usually has a thin wedge-shaped head that can be inserted into the slot or recess of the screw head-also known as a “screwdriver”. There are mainly two types: a character (minus sign) and a cross (positive sign). There are also common hexagon screwdrivers, including two kinds of inner hexagon and outer hexagon. Screwdriver, a tool for up and down screws, generally chrome-plated on the surface of the blade, and magnetized head. Various styles of injection-molded handles are more common, and there are also wooden handles, but they are no longer mainstream. Choose the corresponding screwdriver according to the different screw tails, such as the commonly used cross-tail self-tapping screw, use the ph2 screwdriver. classification Divided by shape: Commonly used one character, cross (PH), rice character (PZ), hexagon, star, etc., then subdivided into: 3/4/5.5/8/10, etc.; cross The subdivision is: PH0/PH1/PH2/PH3; the subdivision of the rice character is: PZ0/PZ1/PZ2/PZ3, etc.; Classified by material: carbon steel, chrome vanadium steel, S2 steel, etc.; According to the shape of the tool bar: round bar, hexagon bar; There are also special ones: the piercing batch with tail nails, the powerful batch with the afterburner sleeve, and the electrician batch with rubberized blade.