1. The bottom of the track with a 3/8 and 1/4 screw interface can be accessed universal camera tripod rail can be used on a tripod. 2. Both sides of the track with 3/8 and 1/4 screw interface easy to monitor and fill light connection. 3.Track pivotal construction adjustment four axis structure consisting commitment we've seen the slide bearing axis structure using all three bearing structure and we'll be improved on the basis of this using the structure of the four bearing axis bearing steel shaft makes contact with both sides of the larger area up and running more smoothly.