I was actually thinking about this yesterday, you really do need two wrenches of each. Locking jam nuts is just one example. I was actually looking at box end wrenches to supplement my box/open end wrenches. In some cases multiple wrenches are required just to cover different access issues.

Quote Originally Posted by katy View Post
Actually one needs 2, one to hold the head of the bolt and one for the nut.

Keep smilin', Ken