Low poly Robot Hand, light version.
The full version is the item number 732446.
If you need only the obj si the item number 898219.

The hand is rigged and you have the control of every joint of the fingers and wrist, some parts are locked in some directions to prevent unacceptable moves, but its easy to unlocked them in settings.

In the wrist control there are fist and spread controls, and the master control of the arm can be parented to a potential forearm.
In the master control you can resize the hand.

Number of joints: 22

The textures are all PNG 4096x4096:
diffuse.png
specular.png
normal.png
reflection.png

I've also uploaded the environment picture and the scene files that I've used to render the hand in mentalray.

Note: the obj it's only the model.