Accessories -Photo Studio Top Boom Arm Highlights Generic Brand Photo Studio Top Boom Arm Description: The boom arm is used in the studio to suspend light photography on the subject or the scene you want to shoot. Combine with your choice of light, softbox or umbrella, will be strong enough to hold most types of lights, but we do not recommend using the arm to hold more than 3 lbs. Jib arm with 2 sections ranging from 75cm to 140cm. Lock four holes on each side to adapt to different brackets. Against the nut can be rotated to hang the lights at different angles. Sandbag hook and provide counterweight against the weight of the lights. Specification: Material: Aluminum alloy+ABS Min boom arm length: 27.55 inch/70 centimeter Max boom arm length: 55.11 inch/140 centimeter Hole diameter: 31, 24, 20, 17mm The package include: 1 piece telescopic mounting arm 1 piece boom arm nut 1 piece counterweight bag (sandbags)