The MH057M0-Q5 heavy-duty ball head uses state-of-the-art materials to give high strength with light weight, incorporating a very stylish look. It's fitted with a 577 sliding plate adaptor which aids balancing heavy equipment. It features a large, easy to grab locking knobs, variable friction control, and a panomamic base with degree markings. The red sliding switch stops vertical positioning of the platform at exactly 90°.