Top tube diameter 35mm. 1 section boom complete with Pivoting Clamp 123 Counter Weight 022 cable clips. One section boom max extension 2 7m (8.8') Adapts to Manfrotto Junior stands Removable adapter with a 3/8 inch threaded tip Dual cranks provide remote control over fixture pan and tilt Aluminum construction with black anodized finish Specifications Weight: 10.8 kg Payload: 5 kg Boom Min Extension: 24 cm Boom Max Extension: 100 cm Attachment (Bottom): 1 1/8? (28mm) stud Arm Tube Diameters: 35 mm Load Capacity At Maximum Extension: 5 kg Top Attachment: 3/8? screw 5/8? (16mm) stud Colour: Black Material: Aluminium Sections - Boom Arm: 1