Contour Enthusiasts Group Archives Forums Modifications Brakes Line Wrench

I'm going to be installing some SS brake lines next week and I want/need to buy a line wrench. There weren't many hits on the search, but one did say that size required was "13 mm as I recall." Can someone verify that this is the correct (and only?) size wrench that I need? I'm assuming they can be bought individually from Sears so I would just like to buy the size(s) that I need now. Thanks!