Holds: Cameras, Lights, Umbrellas, Hooks, Shelves, Plate glass, Corss Bars, flat or round surfaces. Attachment: 16mm hexagonal , 1/4" threads attachment type Load capacity : 33lbs Material : Die-cast Metal Weight : 0.9lbs
Please tighten all the spin levers of the clamp to support the attached items securely. Do not mount it on a board thinner than 3/4inch, or the clamp may not be tightened enough. Use the rubber wedge to mount it on the flat surface more securely.