The Structures allow to have the best functionality of hydropneumatic power units employ. The structures are bound to power units obtaining so pneumatic press speed and hydraulic press force. The work base on the structure is provided with T rabbet. The space between the two shoulders allows the passage of loader arms and manipulators, moreover it’s allow to reduce the stamp dimensions and the press employment in the automatic production lines and/or bench applications. All models can be provided with rod anti-rotation device and standard pneumatic system, to satisfy the majority type of uses.