The Kupo Super Knuckle System is an innovative modular system that features a shell that accepts two ball joints mounted to interchangeable accessories on either side. The shell has a single knob in the center to tighten both ball joints simultaneously. The shell also has a storage compartment with an included 3/8"-16 to 1/4"-20 reducing bushing opposite the knob. The ball joints give you complete freedom to position the accessories anywhere. Features a shell with a 5/8" (Baby) receiver on one side (for attachment to accessories with a 5/8" pin) and a locking thumb wheel with 1/4"-20 male threads on the other for cameras or other gear with 1/4"-20 female threads.