Screw Driver

A screw driver is a tool introduced to be used over the screws. It can be used for tightening or loosening of the screws. The tip or detachable 'bit' of the screwdriver can vary with the sizes, shapes and design of the head of the screws. It is a multipurpose, universally accepted and used tool. Its top handle can be made up of wood, plastic, rubber depending upon the usage and requirement of tool.