I was trying to remember that URL before. Jim is definitely prepared. One thing to remember is you don't always end up working on your car- sometimes you end up assisting aless fortunate motorist. Not that there is thast much you cna do with modern cars but I don't think it hurts to have both a set of metric and SAE wrenches along. If you aren't careful though your tool box can accumulate 200#s worth of tools particularly for those who don't maintain a set of both garage tools and road tools...