So you put your impact screwdriver, hold it firmly in place and administer a firm hammer blow to the end of it. … When you whack the handle with a hammer, it pushes itself forward compressing the spring and pushing that pin deeper in the slot. Because that slot is at an angle, the driver is forced to turn.

How does an impact screwdriver work?

So you put your impact screwdriver, hold it firmly in place and administer a firm hammer blow to the end of it. … When you whack the handle with a hammer, it pushes itself forward compressing the spring and pushing that pin deeper in the slot. Because that slot is at an angle, the driver is forced to turn.

What's the difference between a impact Wrench and impact driver?

One of the key differences between these impact tools is the drive style. Impact drivers use a 1/4-inch hex collet that accepts 1/4-inch hex shank bits. Impact wrenches typically use a square drive that you attach a socket to. There are also 7/16-inch hex impact wrenches that utility workers often carry.