Universal hook to hang things from round bars.
This hook is suitable for bar diameters between ~13 - 25 mm. The hook has 2 ends - one more "open" and other "more closed". It is meant that bar goes to "more closed end" and stays there "locked in place" - eg. once the hook is attached, you can even turn hook upside down and it won't fall. Items will hang from more "open" end.
We use it in our baby carriage to hang light shopping bags and other light items. I also use this at my workshop to hang various tools from my tool-trolley handle.
2) When attaching, it is necessary to bend the hook a bit from more closed end. This relies on ABS flexibility and it provides an easy way to "lock" the hook in place.