The Manfrotto 2942 Mini Boom Arm is a 20mm thick boom arm with a silver finish. It is 41" long, and weighs .7 lb.
It has a 5/8" stud with 1/4"-20 threads on one end, and a 5/8" stud with 3/8" threads on the other.
This boom includes a 3 lb counterweight.
