Material: The greenhouse frame connector is made of high-quality plastic; the fitting is impact-resistant, not easy to crack or break, and is durable. 16mm Inner Diameter: This connector's inner diameter is 16mm. This is the most common size and can be adapted to most plant supports, PVC pipes, or metal pipes. [Stable Support]: The connector can stabilize your greenhouse, which is not easily blown over in windy or rainy weather. It can be used to secure garden supports, secure greenhouse film supports, shade bar connectors, climbing pergola, helping to grow climbing plants such as tomatoes. It's an ideal tool for your plants. [Contents]: The package includes 15 greenhouse connectors to meet your various needs. Note: All data is measured manually, please allow an error of 1 to 3 cm due to differences in light and display, there may be color differences, please refer to the actual item received.