This 20 x 10 x 7 ft walk-in tunnel greenhouse gives you plenty of headroom to move through rows of plants while working comfortably upright. Three top beams and four diagonal poles reinforce the galvanized steel hoops, which measure 0.8 in diameter with a 0.02 in wall thickness, so the frame holds its shape under snow and wind loads. Wrapped in a white 140 g/m² PE cover that fits snugly to the frame, it blocks UV rays and rust while adding wind resistance and warmth for the plants inside. Twelve mesh windows paired with two roll-up zippered doors let you control airflow throughout the day, keeping the interior from overheating while mesh screens keep pests out. Connectors with screw covers protect against scratches and rust, and the kit ships with ropes, stakes and guy ropes for extra stability. At 67.5 lbs, it's manageable to assemble and suits vegetable gardens, flower beds or small commercial growing spaces looking to stretch the season.