An impact drill driver uses rotational force to drive a screw and saves its bursts of quick power when it feels resistance. You would use an impact driver for long screws or large fasteners when working with wood. An impact driver is also lighter than the hammer drill, making it easier to handle. Ultimamac has wide variety ofImpact Drill Drivers. You can get Original Impact Drill Drivers under one roof from Authorized and genuine dealer at the lowest price.