The RIGA Greenhouse bottom shelf suspends from the greenhouse frame, RIGA Greenhouses are the latest in a series of hobby greenhouses from Germany"s most respected greenhouse manufacturer, The RIGA was designed with the homeowner in mind, Shelves are suspended from greenhouse frame and are 25"" deep and length of greenhouse, Bottom shelf is 25"" deep and length of greenhouse, Constructed of twin-wall polycarbonate material that allows better and even light distribution, Holds heavy duty black seed trays, Shelves are suspended from greenhouse frame without braces underneath, allowing for more storage space, German engineering - guaranteed top quality, Dimensions: 166 x 25 x 1, 5 inches, SKU: EXTR103