For Tubes 48-51mm in Diameter. Supplied with M10 Bolt- Washer- Spring Washer & Wing Nut. T Knob Closure. M10 Fixing. 50Kg SWL. Black or Silver FinishSWL: 50Kg Tube Dimensions: 48-51mm Diameter Fixing: M10 Dimensions: 120 x 110 x 30mm Weight: 18g. Slimline- lightweight aluminium half coupler designed for use on 48-51mm truss. SWL 50Kg. half coupler-coupler-lighting clamp