• Curved jaw heads allow to work around edges and protusions • Nonslip brake on moving jaw holds and prevents any free fall of the moving jaw • Grooved fixed jaw for optimum grip of tubes, profiles etc. • Greasing hole through which the screw can be lubricated • Piston system with always fully protected threads • Ergonomically shaped handle, interchangeable and multi positionable • Fully protected double threaded screw • No twisting at all thanks to the piston system • Protected from any outside agent: welding or concrete splats, steel slivers, etc. • Multiplies both the advance and pressure capacity thanks to the double thread