The present invention relates to a metal-box (14) comprising a metal frame (15), at least one metal wall (13) and at least one metal bottom plate (12), wherein the metal frame (15) comprises a metal profile (1), wherein the metal profile (1) comprising an elongated element (2) and a cross-section (3), wherein the cross-section (3) comprising (i) a cavity (4), and the cavity (4) is enclosed by a first flange (5), a bottom part (6) and a first side (8) of a second flange (7), and (ii) a recess (9) enclosed by a second side (10) of the second flange (7) and the bottom part (6).