You may not know this but automata and artificial limbs have shared a long history. It seems only fitting that this relationship would continue to the present day and even into our notions of the future -- science fiction. Shown here is a robotic arm toy that replicates Darth Vader's artificial arm.
The Darth Vader Robotic Arm is a kit that snaps together. It includes the stand with built-in controls. The arm is capable of gripping hand holding lightweight objects. Most surprisingly, no batteries are required!
Be sure to read the positive reviews for tips on how to assemble the arm so that it does all that it supposed to do.
Here is a link to the Star Wars Science - Darth Vader Robotic Arm.