The ProMaster 7″ Articulating Arm is a great way of mounting a variety of accessories to your camera rig or tripod (with compatible connection port) at almost any angle. Use it for an LCD monitor, microphone or sound equipment, small light, phone or tablet (with corresponding clamp), and more. One end of the Articulating Arm features ARRI-style pins. These are retractable, making this a versatile accessory for use with either a -20 connection, standard 3/8-16 connection with the included adapter, or ARRI-style connection using the adapter. When using the arm with its -20 connection, the pins simply retract as the arm is installed. The arm features -20 male screws and ball heads at each end. There is also a pivot joint in the middle that uses two facing rosettes for a secure friction source to prevent the arm from slipping. A single-point locking knob makes the arm quick and easy to use: simply loosen this knob and every joint in the arm will loosen, allowing you to achieve the best position. Tighten the knob and every joint will tighten for a secure grip. The included cold foot and spacer are removable to reveal a common -20 male screw. Alternatively, the spacer can be used without the cold foot to reveal a common -20 female threaded port. KEY FEATURES -Three points of articulation-Single-point locking knob–20 male screws on both ends-Retractable ARRI-style pins on one end-Removable cold foot-Removable spacer with -20 port