An impact drill is similar to an electric drill. The difference is that in using an impact driver you have two types of motion which are rotation and concussive. This help you drive screws in the very thick woods and also work on light concrete . Impact drills are powerful drills that deliver higher torque than electric drills , without recoil. With an impact drill , you will be able to do the things that you can't do with an electric drill effortlessly, like driving large and long screws. Impact drills are not suitable for fragile materials such as plastic and thin woods.Now a days some impact Drills are equipped with multiple speed and torque settings . Two or three torque and speed settings are features that are very handy and help the user to use the tool more easily for smaller screws and decreases the risk of the damage for bits and screws.