Parallel Coupler. High Tensile Aluminium. 35mm Half Couplers. Black or Silver FinishSWL: 100Kg. The Atom Parallel Coupler provides a firm fixing between two parallel bars. The Atom Parallel Coupler provides a firm fixing between two parallel bars. Manufactured from high tensile Aluminium Extrusion.. clamp-doughty clamp-half coupler-truss clamp-lighting clamp-swivel clamp