Promaster Studio Weight Kit The ProMaster Studio Weight Kit allows you increase the stability of your light stands, tripod or other types of supports by adding strategically placed weight. The weight bag can easily be hung from the built-in weight hook on your tripod or mounted to almost any tubular or flat surface using the included mounting bracket. Bag holds up to 8.8 lbs. / 4kg. Clamp to a light stand, hang from a tripod