COMPATIBILITY: This wall mounting boom arm is perfect for supporting photographic equipment like studio video strobe lights, monolights, softboxes, umbrellas and reflectors ADJUSTABLE: It can be fixed on a solid wall, and its length is adjustable from 40.5 inches/103 centimeters to 70.8 inches/180 centimeters TRIANGLE DESIGN: More stable and reliable; Comes with 4 pieces expansion screws helping mount the boom arm on the wall much solidly ROTABLE: The boom arm can be rotated up to 180 degrees, so you can adjust its angle and height synchronously NOTE: This boom arm must be fixed on a solid wall and the monolight in the picture is NOT included