RAM 1″ Diameter Ball with 1/4-20 Stud for Cameras, Video & CamcordersThe RAP-B-366U, universal camera and camcorder base, consists of a 1″ diameter rubber ball, connected to a round plate with 1/4″-20 camera thread. The round plate provides extra support and stability for cameras that rest on top of it. The male 1/4″-20 threaded steel stud will connect to any standard female thread found on camcorders and digital cameras. Compatible Cameras:Contour GPSContour HDGobandit GPS-HDGoPro HD Helmet HEROGoPro HD Motorsports HEROGoPro HD Surf HEROGoPro Helmet HERO WideGoPro Motorsports HEROGoPro Motorsports HERO WideGoPro RC HEROGoPro Surf HeroGoPro Wide HERO Material: High Strength Composite Ball Size: 1″ Rubber Ball “B” Size Note: The “U” in the part number reflects product packaged in poly bag.