The Novoflex QPL 6x6 Circular plate is designed for use with 6x6 medium format cameras and includes four anti-twist pins. Permits clamping in 90 degree steps. Both 1/4 inch and 3/8 inch camera connections are included. The QPL Video plate uses the special safety pin of the Q=System to prevent the plate from slipping out of the base accidentally. Arca compatible.