That one I couldn't really tell you. The different ones formulated for metal binding can be found HERE
. You obviously wouldn't need the threadlocker or temperature resistant, so whichever.
EDIT: You won't need much, maybe the size of a grain of rice or a pea at most. So just get whatever is cheapest / the least amount. Just remember, it is epoxy, so if you don't get the "quick set" it will need the full allotted time to cure.