There are three types: Solo shelving: Cost effective fully adjustable single skin upright shelving system. Solo uprights are manufactured from one-piece steel and feature a delta front edge with no sharp edges, so eliminating snagging when loading shelves. Duo shelving: Duo shelving with its double skin allows the full shelf width to be used, with clear unimpeded access for easy insertion and removal of files. Duo shelving satisfies the common These slim profile uprights and shelves are aesthetically pleasing making Duo shelving ideal for today’s modern office and commercial environment. Mono shelving System: Cost effective fully adjustable shelving system. Mono uprights are open with horizontally braced frame and feature a smooth front edge with no sharp edges, so eliminating snagging when loading shelves.