Manfrotto 819-1 Small Hydrostat Arm - This arm spans 22 cm and can support up to 2,2 Kg. The 819-1 is the ideal companion for attaching a video monitor to a camera or using as a fl ag support. Like the 814-1, the pivoting pins are 1/4" and 3/8" threaded with one side offering a platform to provide a larger footprint for the equipment being supported by the arm.