This 3-pack of Gitzo 50 mm Big Foots is designed for Gitzo tripods or monopods that connect to an existing foot with a 3/8"-16 thread. Each 50 mm Big Foot features a 50 mm wide rubber pad that forms a ball joint connection with a steel 3/8"-16 mount, which screws into the bottom of a compatible tripod or monopod. When a 50 mm Gitzo foot is used, the ball joint allows the rubber pad to tilt, ensuring full contact with a flat surface regardless of the angle position of the connected tripod or monopod. By maximizing contact with the surface it rests on, it enhances the ability of a tripod or monopod to provide a stable platform for a camera, sports optics, or accessories.