It fits all sleeves with the 5/8" (16mm) standard. Since it is made of "soft" brass, it can always be fastened well, since the screws screw a little into the material. The spigot has a thread at both ends. Once 1/4" (m) and once 3/8 (m). Thus it serves as a universal interface in everyday studio life for lights, holding arms, grip accessories, small devices and, in an emergency, a camera.