Image 1 of 1 Junior Boom $25.00 It measures 68" when collapsed, and extends to 10' (3.3 m). It has a Junior (1-1/8") mount and a 5/8" stud. A 25 lb counterweight is attached. Quantity: Add To Cart Added! It measures 68" when collapsed, and extends to 10' (3.3 m). It has a Junior (1-1/8") mount and a 5/8" stud. A 25 lb counterweight is attached.