Produced of aluminum, easy to carry & use. Suitable for Outdoor antennas photography, film production and other occasions. It can be installed in multiple situations with the picture transmission brackets Strong compatibility 17-30mm center hole distance, suitable for a variety of situations. Professional photographers, enthusiasts and video production team Flexible combination allows graph transmission to be used in more situations. 3mm positioning screws 3mm positioning screws designs to deflections. Double 1/4 hand twist knob 1/4 standard screw for high versatility.