Tail Rotor Shaft Assembly H50037Instruction:Use for T-REX 500.Specification:Metal drive pulley(19T) x 1(Φ4.4xΦ6xΦ11.75x4.15mm)Metal pulley cover x 2(Φ4.4xΦ14.5x4.5mm)Tail rotor shaft x (Φ4x56.8mm)