The quick release mounting base uses a clamp that locks by itself rather than a traditional knob. It lets you instantly mount the quick release plate in just one step. Multifunctional Interfaces for Wide Compatibility The quick release mounting base is designed with an Arcac-Swiss interface on the side and the bottom contains 1/4” and 3/8” threaded holes, which is widely compatible with gimbals, plates, tripods and sliders.