Fingernails are reasonably in the same area on all skins, although not exact- but they should work fairly decently. Toenails aren't even a little, they vary wildly by skinmaker, so I can't make any guarantees these will work with any skins other than Schadenfreude skins. There are glove and sock nails only- no prim nails. I don't wear prim nails, the whole floating when my hands change thing...not my thing (and with the animation hand priority bug, even wearing an AO made with that in mind doesn't get around it, in my experience).
Available separately by colour, and in a fatpack of all 7.