A manual impact driver is a tool that delivers a strong, sudden rotational force and forward thrust when struck on the back with a hammer. It is often used by mechanics to loosen larger screws and nuts that are corrosively "frozen" or over-torqued.

What is an impact driver used for?

Impact drivers are designed for efficiently driving long deck screws or carriage bolts into wooden posts, fastening concrete screw anchors into block walls and driving screws into metal studs. It isn't intended for drilling. Be careful to not over-tighten screws when using an impact driver.

Whats the difference between a drill and impact driver?

The main difference between a drill and an impact driver boils down to power and rotational action. ... Impact drivers tend to be more compact and lighter than most drills, but impact drivers usually deliver more power for a given size of tool while also keeping the driver bit more completely engaged with the screw head.