Stable and not cracked: The greenhouse frame joints are made of high-quality plastic with special treatment. The accessories are shock-resistant and won't crack or break easily. They provide solid support for your vines even in severe weather conditions like storms. 16mm inner diameter: The inner diameter of this connector is 16mm, suitable for PVC pipes or metal pipes with an outer diameter of 16mm. This is the most commonly used size in life and can fit most plant support poles or PVC pipes. Two different types:This package contains 8 pieces of 3-way rattan connectors and 4 pieces of 4-way greenhouse frame connectors, which is the most practical combination according to customers, which can meet your various greenhouse construction needs without wasting money. Help vines grow better:The connector stably supports your greenhouse, allowing your tomatoes or other vines to grow smoothly, providing a stable home for your plants. The precise right-angle design makes the greenhouse structure more stable, and it is not easy to be blown down in strong wind or rainy weather. Essentials tool for your gardenThe 3/4 Greenhouse Frame Plant Connector is very suitable for building flower stands, greenhouse supports. It can be used to secure garden trellis poles, secure greenhouse film supports, shade pole connectors, climbing pergola, help to grow climbing plants such as tomatoes. It and it is an ideal tool for your plants. Specification: -Material: plastic. -Quantity: 12 pieces. -inner diameter: about 16mm/0.63in. Packing Includes:8 x Right angle 3-way connector 4 x Right angle 4-way connector.