Best Way Tools Phillips #2 X 2 in. L Double Ended Screwdriver Bit Carbon Steel 150 pc 10 00 001 166 Sub Brand: StudSensor Color:Brown Sub Brand: StudSensor Don't compromise when it's time to update your chimney use the MetalBest ultra temp 8 inch diameter chimney pipe adaptor chimney pipe to get the perfect result the first time All screws have a head with a contour such that an appropriate screwdriver tip can be engaged in it in such a way that the application of sufficient torque to the screwdriver will cause the screw to rotate A screwdriver bit is a tool for driving screws and one that can be fitted to most drilling power tools