[Versatile Use] - Suitable for flower stands, greenhouse frame construction, sheds, tent connections, tomato support frames, etc. You can DIY a suitable frame structure through different assembly methods. [Durable Pipe Fitting] - The greenhouse frame construction connectors are made of plastic, the fit can withstand shocks and is not easy to break. [Size & Package] - Inner diameter: 16 mm. Please measure the size you need before purchasing to avoid model mismatch. Included: 4 x Fittings. [Versatile Selection] - We offer a variety of connector types for you to choose from, allowing you to find the perfect fit for your specific greenhouse construction needs. This variety ensures flexibility and adaptability to meet various needs [Easy to Install] - The installation method of our pipe joint is very simple, no special tools are needed for cutting, just twist the pipe into the connector to easily and firmly connect the pipe