Aluminum stud? Are you sure you don't have galv stud like used in typical commercial partition walls? If that's what you got just get the straight cut (yellow handle) set. With the web of the stud facing you cut the two returns then just open it up enough to get the body and head of the snips in there and as you cut across squeeze and roll the stud with the hand you're holding it with. Kinda of hard to explain but you'll get it.