This stand is designed for a construction helmet MSA V-GARD. I do believe that it will fit on other types of helmets, so far I didn't tested it. I already performed a functional test and everything is working fine. I highly recommend a chinstrap to be used while on the stand there is a camera mounted.
If you like check the video which I made for this project:
GoPro_construction_helmet.stl | 451.4KB |