Here is the second style of the robot arm:
Here the link to CgTrader where you can buy it:
The description is:
The robot arm is an unique mesh and unwrapped without overlapping.
The preview image is rendered in mental-ray and occlusion.
Number of tris: 6,304
Number of joints: 21
Features:
- roll control
- twist control
- global scale control
- grab/fist control
- switch on/off orient wirst contorl
- free rotate control of each joint’s finger
- show/hide finger controls