These Heavy Duty Dual Swivel Clamps for 50mm Tubing is ideal for joining truss systems or pipe with an approximate 2" (48-51 mm) outer diameter. It has 2 M12 bolts which tighten down via a large wing-nuts. It is rated at 1,100 lb (500 kg) load capacity. It is compatible with the F31/F32/F33/F34/F44P truss series and is TUV-approved.