Terms of the Trade: What Is an Impact Driver?
An impact driver is a small, lightweight version of a standard drill. It operates with more torque than a drill, providing short bursts of force useful during large projects to quickly drive large fasteners such as screws and lag bolts. Impact drivers can reduce strain on your wrists as well as time during extensive projects. They also happen to strip screws less than standard drills because the short pulses are more controlled and keep better contact with screws.