Instructions: ●Use for T-REX 550E/600E/600N/ 700E/700N。 ●Must with: V2 Metal Tail Rotor Holder/Silver(HN6103B) Specifications: ●V2 tail rotor hub x 1(Φ10x43.6mm) ●Tail rotor washer(Φ8xΦ10x0.3mm) x 4 ●M4 set screw x 2(M4x4mm) ●socket collar screw x 2(M3x8mm) ●Weight:10.7g