Neewer 30"-75"/76-190cm Swivel Head Aluminum Alloy 1/4" Thread Mount Boom Arm Holder with Sandbag for Reflector,LED Video Light,Strobe Light,Monolight and Other Photographic Equipment This reflector holder arm support is made from aluminum alloy and has 3-section extension arm for different sizes and shapes reflectors. It comes with a 1/4"thread screw which enable you to mount reflector,LED video light,monolight or other lighting photographic equipment that have 1/4"screw thread for better photo shooting. Its flexibility is represented by adjusting the length at the range of 30"-75"/76-190 cm through two locking knobs. Clamp pivot connector:Connect a boom arm to light stand and enable to adjust the height,angle,and other positioning. Black/blue sandbag:Dual interior compartments with double zippers for each compartment.Can be filled with anything:sand,gravel,even nuts and bolts.Note:Reflector,Light Stand,Video Light and Strobe Light are NOT included.