It is a prototype. I have made in the beginning a hand on the computer in 3d, then already of a steel. In the manipulator there are not enough freedom degrees, but simple operations can be carried out. Depending on the application purposes it will be possible to finish a manipulator design.
Manipulator repeats the movement of the hands, while a block levers to increase compression. Manipulator is easy to put on the hand and does not require additional fastening. Mechanical hand easier to manufacture, since almost all of the manipulator is made of steel 3 mm.
Mechanical hand may be made of different materials. Material depends on the destination of the manipulator. Shown here is a variant of steel.
The first version of the drawing of the manipulator.