You can buy them for both -3 & -4 rivets. They are useful in a few areas, but in really tight areas like the trailing edge of a control surface, you can't get the nail/die combination into the available space.
I found them more useful when I 'missed a dimple' & discovered it after assembly had started.
More useful for tight spots near an edge are the vise-grips with the dies welded to the jaws.
What I've often wished for is the same type of die, but with the female half threaded to accept a threaded 'nail' so you can get them in those tight spaces. Well, I went to Avery's web site so I could show you a link, & guess what....
http://www.averytools.com/c-72-dimpling-tools.aspx
edit: oops; just noticed that the screw types are for screw heads, not rivets.
Also, if you're thinking of using the pop type to dimple the whole plane, you'll be dimpling for a loooonnnnggg time.
Charlie