This screw on to a Tripod?
Yes this mount will screw on a tripod. It has threaded holes on base and side of stand. The swivel is a very useful feature and the mobile device holder is removable for more mounting options. As it is all aluminum and great build.
What is this made of? How is the quality?
It is all metal and formed in one piece. The board part is solid and it holds my iPhone very securely.
Can it fit the tripod ball head U-80L?
Yes. It has a 1/4 screw hole at the bottom that can be installed.