Pet @ www.gymratz.co.uk ;¬) wrote:

From my years long gone by, an impact driver was a fat bodied
mechanical device operated by a sharp blow with a lump hammer.

Yes, this is an impact driver:
http://www.screwfix.com/app/sfd/cat/...16735&ts=72305

But more recently, these have become known as impact drivers too:
http://www.screwfix.com/app/sfd/cat/...57026&ts=72305

It's basically a battery powered, rechargeable version on an impact wrench.

The reason they're used for screwdriving is because they can deliver
huge torque (albeit pulsed) compared to the same size/weight cordless
drill/driver.


--
Grunff