The linkstar lba4i-ba light boom + sand bag is supplied with a tube clamp and is compatible with all light stands with a diameter of 3 cm. the included tube clamp allows you to position the arm in various positions to suit your needs. the supplied sand bag acts as a counterweight and is hung from the hook located on the end of the light boom. the lba4i-ba for example, allows you to hang your studio lighting above the subject you’re shooting, without being visible in the photo or video. the lba4i-ba also provides you with greater freedom of movement around the studio or on location. Please note: the light stand shown in the photos is not included in the delivery. an optional light stand can be found in the optional accessories tab below.