This convenient studio boom allows you precision, geared directional light control. Dual drives provide light movements of 180° (in a plane parallel to the boom) & 360° (in a plane perpendicular to the axis). The boom arm measures 8 5/6' (2.7m) long with a 5/8" mounting stud, is counterbalanced with a 14 3/4 lb. (6.7kg)adjustable counterweight & is attached to a swivel mount with 180° adjustment. Requires a " Cini" style st&.