Amazon.com : Outsunny 20' x 10' x 6.6' Walk in Tunnel Greenhouse with Outsunny Tunnel Greenhouse Upgraded Structure, Hinged Doors, 4 x 3(m Outsunny 19.7' x 10' x 6.6' Walk in Tunnel Greenhouse, Reinforced Amazon.com : Outsunny 20' x 10' x 6.6' Walk in Tunnel Greenhouse with. Galvanised steel frame with top reinforcement rods for a strong, stable core Two hinged doors for easy access both sides. Latches to keep safely shut Middle mesh windows to allow fresh air inside 20cm long cover edges to bury into the soil for added stability Assembly required, two three people recommended to assemble Colour: Green Material: Galvanised Steel, 140gsm Polyethylene, Polyester Overall Dimensions: 600L x 300W x 200Hcm Side Window Dimensions: 80W x 50Hcm Door Dimensions: 80W x 190Hcm Extended Edge Width: 20cm Galvanised Steel: 0. 98 0. 75 Dia. Windproof Level (when fully fixed): Level 6 Item Label: 84H 033V00GN