This is a view from the outside. Once the holes were originally drilled, I then had to countersink the holes so that I could use these flush head rivets. The leading edge is the first thing to bite the air and it is important to have smooth air flowing over the wings...regular rivets would protrude above the skin and cause a little bit of turbulance over the wing. If you saw "The Aviator" (great movie), you remember what a big deal Howard Hughes made about flush rivets and smooth skins....I'm talking about airplanes here. Same idea. Some guys use flush rivets for all of the wing skins. That takes a lot of extra time...don't think I'm gonna do it.