This set is well suited for the homeowner who wants to build a tower over 20' and is okay with a heavier frame. The benefit to using this set over using the 5' X 5' set is cost. A 20' tower can be built with three sets of 6'4" tall vs four sets of 5' tall, saving around $100 in material cost. The disadvantage to using this frame is the weight. The 6'4" tall set weighs approximately 10 lb heavier than the 5' tall set. Our 5' X 6'4" set meets and/or exceeds all OSHA regulations.The frames have three ladder rungs and uses our premium c-locks. To maximize the life and longevity of our scaffold sets we apply a high visibility yellow powder-coating by the highly rated AkzoNobel.