The impact screwdriver allows the impact from the hammer to be transferred directly to the screw. When the user strikes the back of the impact driver with the hammer, the mechanism inside the driver converts this strike into a rotary motion, increasing the torque applied to the screw and making it easier to loosen. Impact drivers are an invaluable tool in situations where conventional screwdrivers would not be effective enough, such as when working with screws that are tight or have damaged heads.