Features: 16mm frame connerctor: There are five styles to choose, mainly used to stabilize the linker for high-strength greenhouse frame construction. It is widely used in the construction of flower stands and greenhouse frames. High-quality material: We are made of high-quality plastic material, and the accessories can withstand impact without damage. Stable support: The connector can support your greenhouse stably and is not easy to tip over in strong wind or rainy weather. 5 types: There are 5 types of connectors for you to choose to meet your various greenhouse construction needs. Inner diameter: The inner diameter is about 16mm, suitable for PVC pipes or metal pipes with an outer diameter of 16mm. Specifications: Material: Plastic Inner Diameter: Approx.16mm/0.63in Type: A/B/C/D/E Package Includes: 1x PVC Fitting note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.