Greenhouses, Greenhouse Shade System manufacturer / supplier in China, offering Aluminum Shaddle Clamp for Greenhouse, Metal Galvanized Rings and Clips, Galvanized Steel Wire Holding Clips and so on.
It is the last photo.
You have seen all photos.
Here is the show of how the plant hooks are assembled with strings.
High quality of strings, and best way of production make it cheap in price, and fine in quality