Description：

    Applicable for upgrading and modifying 550/600 helicopter. Various colors of ball link can meet your demand. Structural design can effectively improve flight stability, satisfy flight load requirement. 

Caution:

1.The weight reduction hole is chamfer outwards.

2.Linkage ball and ball link need to be installed with zero tolerance. And confirm it can turn smoothly. Can use reamer or WD40 lubricant.

Specification:

550/600 Radius Arm×2 (Φ4.75×28×18×8.5mm) 1.0g