Plant clips

This is a clips for sustaining plants on a string. The hook has a small gap, allowing the string to be locked in place. The pin is introduced in the hook from down side, allowing the string to be locked with it inside of hook.
I designed this having in mind tomato plants which need a way to sustain them on a string, but probably this could also work for other plants as well.
If larger rings are needed, you can combine two of them.