Low poly Robot Hand, light version.
The full version is the item number 732446.
The light version is the item number 746950.

This item is only the obj, the same Hand rigged is the item: 732446
If you don't need to show the inside you can reduce the number of poly down to 3031 faces / 6022 tris / 3506 verts.

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

The render on the pictures is done in mental-ray, with an environment ball for the reflections.