QUADLOCK TQ390 is an aluminium 4-point truss cross beam with 390 mm outer dimensions, four 50 mm diameter main chords with 2 mm wall thickness, and 20 mm diameter braces with 2 mm wall thickness. It uses a conical connection system with cones, pivots and pins, supported by a Quick-Lock assembly system. The beam is TIG-welded from EN-AW 6082 T6 aluminium and is TÜV Süd certified.