They don't require any cutting or drilling, using the factory screws and some new ones using clip nuts on the fender lip. They rest against the body with a rubber edging. I hope they don't rub through the paint eventually but I plan to Line-X the rocker panels someday, maybe I'll do the fender lips also. I think these are exactly like the extend-a-fenders except they have pockets for screws that are just for show.
They have stainless steel hex drive bolts in the pockets that are real but they don't actually attach to anything. I think they look good with the factory chrome emblems and stainless steel running boards.
I need to get some 35" tires now though!