This frame is used as a replacement frame to our biljax style 5ft x 6ft 4in set or for building custom sets and towers. This frame is well suited for the homeowner who wants to build a tower over 20 feet and is okay with a heavier frame. The benefit to using this frame over using the 5ft x 5ft frame is cost. A 20ft tower can be built with 6 frames vs 8 frames saving around $100 in material cost. The disadvantage to using this frame is the weight. The 6ft 4in x 5ft frame weighs approximately 5lbs heavier than the 5ft x 5ft. Our 5ft x 6ft 4in frame meets and/or exceeds all OSHA regulations.The frame has three ladder rungs and uses our C-Locks. To maximize the life and longevity of our scaffold frames we apply a high visibility yellow powder-coating.