"Long-time Pittsburgh-area deck builder and Invis-A-Rail founder Bob Viviano says that he developed his patented infill railing system as a less-expensive, less-complicated alternative to cable railing systems. The design consists of two major components: a pair of anodized aluminum support channels that come in either 6-ft. or 8-ft. lengths, and vertical 304-grade stainless steel rods with hooked ends that fit into slots spaced 3-in. o.c. in the support channels. The vertical rods are inserted into the slots in the channels (which are cut to fit), and then the channels are screwed to structural upper and lower rails (supplied by the builder) to create each rail section."