Matthews Knuckle Head The ultimate positioning device. Mounts to a 5/8" male or 1-1/8" female, and is internally threaded 3/8-16 to support standard camera accessories. It rotates in all axis and will easily support up to 15 pounds. Made for Dots, Fingers, Flex Scrims and small light fixtures accepting 5/8" male. Add the Scrim Flag Adapter (Matthews #540023) for Flags and Scrims.