Multipurpose shelf which provides extra useable space in your Greenhouse. As the name suggests it can be used like a big Seed Tray as you can plant directly into it, or use it as a potting up bench or a staging unit to display plants, line it with polythene and put stand your pot plants on capillary matting, the choices are endless. It is designed to go the full length of the side or the full length of the gable. The length shown is not the actual length of the Seedbed but the length of the Janssen Greenhouse side or gable it will fit into, the Seedbed is slightly shorter. Mill Finish means the aluminium does not have a surface treatement such as powder coating or anodising, it will weather over time (but is cheaper than the Powder Coated version).