The Stroboframe Vertaflip PHD (Professional/Heavy-Duty) is a fast, convenient tool for rotating your camera horizontally or vertically on a tripod. Gain speed, convenience and precision by rotating the camera without changing the lens axis so that all tripod head controls remain in the same position. Concentrate on the subject, rather than fumble with newly positioned controls. Switch between horizontal and vertical compositions with a simple flick of the wrist, keeping weight always balanced over the tripod's center. Standard 1/4"-20 tripod socket in base and 1/4"-20 mounting knob in camera platform Durable double-link construction assures rigidity even when using medium format cameras Accepts optional Anti-Twist Plates and Camera Auto Quick Release.