I use a nut driver to drive that type of head. There are also nut
drivers with a 1/4" hex shaft on the other end that can be inserted
into an impact driver. Plenty of power there.

On Wed, 13 May 2009 19:51:55 -0700 (PDT), eljainc
wrote:

Hello,

I am trying to find a wrench that will will drive a 5/16" hex screw. I
would like a ratcheting type wrench. It should not be a right angled
wrench but a straight one. I only have about 2/3" clearance to work
with.

Any ideas?

Thanks
Mike