Screw bit is a detachable, interchangeable metal tool designed to fit into a power drill or screwdriver handle, engaging with the recess of a screw head to transfer torque for driving (installing) or extracting (removing) it. The bit consists of a shank that connects to the tool and a tip shaped to match a specific screw head type, such as Phillips, Torx, or slotted, allowing for efficient and secure screw manipulation.