Exaco RIGA V Top Shelf - Single Top Shelf for Exaco RIGA V Model Top shelf is 14" deep and length of greenhouse Top shelf hangs forward and does not block outside light from reaching the bottom shelf Heavy duty construction make this top shelf strong to hold plants and accessories Shelving has polycarbonate inserts for more light Spare parts are specific only to the RIGA greenhouse line. These are not designed to work with other brands of greenhouses