The ProX T-C5H Hook Trigger Clamp With Large Wing Nut is a 360° wrap-around tube truss clamp designed to securely mount heavy lighting fixtures to truss chords or other 2″ OD pipes/tubes. The hook design will support the load while tightening and securing the clamp to a tube. It’s compatible with F31-F32-F33-F34-F44P truss chords.