Bits are small tools commonly used for drills or screwdrivers. They are used to screw in or unscrew screws or other fasteners. Bits have different shapes and sizes to fit different types of screw heads, such as slotted, Phillips, hex, or Torx. They are usually made of hardened steel and have a magnetic tip to hold the screw in place. Bits allow fast and efficient fastening of screws and are an indispensable tool in any workshop or home.