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The Manfrotto 7" Hydrostatic Arm features a revolutionary locking system that produces a firm lock with very minimal effort. The system incorporates a technically advanced ball locking mechanism using hydrostatic action that is based on principles of modern hydraulics. With just a slight turn of the wrist, the arm securely locks in the desired position to firmly hold any camera, monitor, or accessory.
This arm spans 7" (17.8cm) and can support up to 4.4 lbs (2kg). The 819 is the ideal companion for attaching a video monitor to a camera or using as a flag support. Like the 814, the pivoting pins are 1/4-20" and 3/8" threaded with one side offering a platform to provide a larger footprint for the equipment being supported by the arm.