google impact driver and you will find a great picture in Wikipedia of the hand held one. No batteries, no air compressor. And this thing will do things for you that you can not do with the electric or air ones. Particularly for fine work where you dont want to break stuff, Because you hit it with a hammer the first impulse drives the bit into the work, and the torque generated is very precisley applied. Jim _________________________________________________________________ Enter the "Telus Mobility Xbox a Day" contest for your chance to WIN! Telus Mobility is giving away an Microsoft Xbox. 360 every day from November 20 to December 31, 2006! Just download Windows Live (MSN) Messenger to your IM-capable TELUS mobile phone, and you could be a winner! http://www.telusmobility.com/msnxbox/