I dont know what the difference is between Manual Impact and one of the new 18v impact drivers is, but they are labeled as an Impact Driver, Some are not big but all major cordless tool makers offer them and they are cheaper than many drills. I saw at sears several big and very heavy 24v inpact drivers by maybe Sears and Dewalt that looked like they could do any job on a car, and there are many more lighter duty units, lighter than drills for screws. For screws they surpass drills in heavy work like making decks. Popular Mechanics magazine just did a review of 9 LiIon Impact Drivers, but not the big ones I saw at Sears.
reply: A manual impact driver is driven by a hammer. An electric is driven by a motor. An electric drill with an impact setting is an electric impact wrench, not an electric impact driver. HTH.
Steve
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