For Tubes 48-51mm in Diameter. M10 Fixing. 250Kg SWL. Black or Silver FinishSWL: 250Kg Tube Dimensions: 48-51mm Fixing: M10 Dimensions: 160 x 107 x 30mm Weight: 50g. Self locking clamp for truss 48-51mm in diameter. SWL 250Kg. lighting clamp-self locking clamp