I thought maybe I can find an entire list of all the socket sizes the Cobalt uses, but I'm not finding such thing. I have been going through the sizes I've used before. I noticed I had some standard size wrenches I have used to cheat since I didn't have the metric size available. I'm asking because I'm putting together a tool kit to keep in my car that has ONLY the sizes I need. I don't want to carry tools I don't need. So far, I have 14, 15, 18, 19, 21, and 30. If anybody can add to that list, I'll be sure to put it on my shopping list.