Doughty T58400 Twenty Clamp black - aluminium pressure die-cast clamp designed to suspend luminaires up to 20kg. This Clamp can be secured to tubes with a diameter of 48-51mm with just two turns of the Doughty knob - lunminaires are secured via a captive M10 or M12 bolt (M10 supplied), damage to tubes and truss is eliminated by using an extruded trigger. Fully TUV approved. Dimensions: 100 x 28mm (HxW). Weight: 0.28kg.