Neewer Photography Studio Video 5-Feet Telescoping Photo Boom Arm with Sandbag The boom arm kit includes one (1) telescoping boom arm, one (1) sandbag, one (1) tilt boom arm attachment and one (1) sandbag hook. Boom arm length is adjustable from 1 feet 11 inches - 5 feet 2 inches, 5/8 inches stem. Counter weight Sandbag is 7x13" and has 2 pouches. The kit is strong enough for most lights with a soft box or large umbrella. The kit can be integrated perfectly with any additional studio light stand to make a hair light boom stand in order to eliminate shadow or glares.