You must be logged in and verified to contact the designer.
This is a replacement knee joint for the Rockin' Action Rockman.EXE toyline. I've successfully tested it with the Megaman mold.
If you've found this product you probably already know that the plastic Bandai used for the Rockin' Action line grew incredibly brittle over the years, leaving many figures as quadruple amputees. Check my store for most of the other joint types, and let me know if you need one I haven't reproduced yet.