Godox PB960 Multifunction Clamp

Can be fixed to surfaces up to 60mm thick. Has 2 x 3/8′ male threads for mounting ball head and camera.

The Manfrotto 043 Sky Hook Adjustable Gaffer Clamp is a lightweight gaffer clamp, with adjustable jaws to handle tubes from 1″ to 2-1/2″. Features one fixed 5/8″ stud, and one 5/8″ socket with double-ended 3/8″ to 1/4″ spigot.