Manfrotto 420B 3- Section Combi- Boom Stand with Sand Bag - Replaces 3397,3397B (Black)This is a Manfrotto Combi Boom Stand. Extend the second riser of this medium duty black aluminum light stand to its maximum, press a lever, and you have a stand with a two section boom arm. When used as a boom stand, its maximum load is 4. 5 lbs (2 kg) strong enough for a small light fixture with a small softbox or umbrella. A sandbag counterweight is supplied (empty) and recommended whenever boom is extended. Sets up easily in a matter of seconds