Selection of hardened and ground steel modules for solid and precise positioning equipped with exclusive mechanical self-centering three-jaw clamping system. They allow workpieces to be clamped in a vertical or horizontal position and easily machined on more sides without the use of brackets or vices and without magnetizing the workpiece. They are fully managed by CAD/CAM or Simulator through the product library available in standard format for any software. Sole modular system available in different heights whose standard includes the set of pins for positioning and clamping of workpieces with thread sizes from M6 to M60.