Semi-light metal formwork Medium designed for to build different sizes of columns, both square and rectangular. The still sheet has a thickness of 3 mm, providing with the panel frame a great resistance and durability. The panel has a concrete pressure resistance of 75 KN/m2. The closing system is integrated in the main panel avoiding its loss.. The panels can be combined with each other to get different kinds of columns sections: from 25 to 45 with the panel of 50 cm from 25 to 70 cm with the panel of 75 cm.