I use 5.5" pads on my Makita 9227C rotary. I have some 5.5'' Ubers coming in and I have the Lake Country original 5.5" and Lake Country Hydrotechs in 5.5". I use a 5" Chemical Guys Evolve4R foamed backing plate that conforms to curved panels to hold them. I also have a 3" backing plate that is coming tomorrow with some 4" Uber pads for harder to reach areas and smaller panels. It comes with an adapter to use both on the rotary and d/a.