For Tubes 46-51mm in Diameter. M10 Fixing. 250Kg SWL. Black or Silver FinishSWL: 250Kg Tube Dimensions: 46-51mm Fixing: M10 Dimensions: 170 x 110 x 50mm Weight: 50g. Self locking clamp for tubes 46-51mm in diameter. SWL 250Kg. lighting clamp-self locking clamp