Lightweight. Supplied With bolts. High Tensile AluminiumSWL::- :- 100kg Tube diameter: :- 48-51mm. A super-lightweight clamp- constructed from high tensile aluminium extrusions- designed to fit bars with diameters between 48mm – 51mm. The clamp is slotted to hold captive an M10 nut or bolt head.. doughty fixing-doughty trussing-doughty coupler