The technical details behind this Flex Arm HD
ProMaster Flex Arm HD (Heavy Duty) – Standard 55.9cm (5521) offers reliable features. It is an all-purpose helping hand for a photographer while shooting. And it can handle a heavier load than ProMaster’s 5514 ‘standard’ flex arm. It connects to a variety of clamps, tripods, and other grip items so you can hold and maneuver a light, flash, reflector, monitor, or another accessory to aid in your photography and videography.
Key Features
3/8″ female thread in brass stud on the other end
1/4-20″ male thread on brass spigot on one end
22″ / 55.9 cm long
Top three Reasons we think you will love this Flex Arm HD
Works well
Great Quality

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