Quote Originally Posted by adamc11 View Post
Would an impact driver with a strong impact screw bit work? I have a Makita BHP454 hammer drill with batteries and charge, i could either of these

http://www.makita.com.au/products/lx...driver?Prodid=

http://www.makita.com.au/products/lx...wrench?Prodid=

I think for the BTW251Z though i would need an adapter to for in a screw bit.
BHP454Z is not really suitable. It is a hammer drill for drilling masonry......
BTP140Z is cheaper and more straightforward. However, for car use, the BTW251Z is great for everything else since it has a 1/2" square drive. It is very expensive though, I expect it to cost AU$600.

Personally, a $90 Ozito or some cheapo brand will work since this will not be for constant high stress use.