Screw to something you want to mount on a bicycle, then O-ring this to the bicycle.
I had to print this with support. It may be possible to turn the ...model sideways if the O ring mounts and equipment mounts are beveled a bit, or the main part is made narrower so that those bits start printing on the bed.
I bought a Nova Bull light for my bicycle, which is normally used on emergency vehicles, and needed a way to mount it. Since I use a handlebar bag, the bar was out, so I decided to go for mounting on the fork where I had been putting regular bicycle lights. This seems to work very well.
If they still "don't see me" with this, I guess a full police light pack is next :)