Yours doesn't have the same shape as the studs that DCMatt posted. Although he is always always, always, correct, I'm not sure on this one. Whatever Dug has posted seems to be more in line with what you have. Like him, I have dug several of these and am not sure what they are. Many, like his, have rust on one end. That suggests to me that it may have had a screw attached and could be a drawer pull or some other type of pull. Just a guess. Does yours show any sign of rust or a hole where the large end of a small screw may have been inserted?