Metal Main Rotor Housing H55004T for RC helicopter Align T-Rex 550. Included:main rotor housing,damper rubber (Ø7.9xØ13x6.5mm) - 2 psc,spacer (Ø8xØ11.5x1.3mm) - 2 psc,pin (Ø2x32mm) - 2 psc,socket collar screw x 1(M3x22mm),M3 nut.