Flex Arm HD (heavy duty) - shortProMaster's heavy duty short flex arm is a great way to hold accessories while shooting. It has less length than the ProMaster 5521 HD flex arm making it lighter and less difficult to maneuver with a smaller reach. But it retains the heavy duty ability to carry more weight than a 5514 or 4605 flex arm. Bent to a 90 degree angle this flex arm is particularly helpful for holding a monitor on a video tripod head.