Torque Tube Front Drive Gear H50096AT for RC helicopter Align T-Rex 500. Included:Front drive gear assembly (Ø4xØ4.7x42mm) - 2 psc,Front long umbrella gear-25T (Ø18.5xØ8x25.4mm) - 2 psc,Front short umbrella gear-25T (Ø18.5xØ6.5x11.8mm) - 2 psc,Pin (Ø1.5x6.8mm) - 2 psc.