* Metal output ball bearing adopts hexagon connected with round swing arm to make sure the reliable of connection.
* The size of the round swing arm adopts general specification and inner screw cap structure to make the combine connection convenient to users and also to expand the service life.
* Supporting axle adopt the structure of fixing the screw cap inside and locked outside, so that it's convenient to install the out parts of the robot.
* The side face of servo set serial interface of signal line, so that users can choose the traditional parallel connection line, or choose the simple serial connection line as they like.

Includes:
1 x servo
1 x swing arm

Please explain:
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