I havn't seen that particular one, but the pattern is familiar, it is a lugnut socket for alloy rims with recessed nuts. The ribbed rings are supposed to hold a plastic sleeve to protect the rim (they fall off after you use the socket three or four times)
I would guess factory tool, most casual automobile owners don't have impact guns lying around...
(When you need an impact socket to get the spark plug out, you are well beyond what factory service can help with ;P)