Rock Steady Ball - Aluminum ball with standard 1/4-20" threaded stud and locking thumb nut. Fits camera tripod sockets such as Drift, Sony, 360fly, JVC, FlightCam, etc. Use this adapter with any Rock Steady ball mount knuckle or the Robinson Tow Ball Mount.
Pilots HQ responded promptly to my order. They were delivered on time and pricing was reasonable. I would order from them again. Top notch company, very professional.