Screwdrivers +-

Screwdrivers + and - refer to the two most commonly used types of screwdrivers. The + (Phillips) screwdriver has a cross-shaped head and is used for screws with cross threads, while the - (Flathead) screwdriver has a flat head and is used for screws with a single gap. Both types of screwdrivers are important in a wide range of applications, from furniture assembly to electronic device repair, as each is designed to match the thread type on a specific screw.