Abstract: The present invention relates to a method of fabricating rigid section bars able to be articulated manually, comprising a first phase wherein, on a band of suitable material, a succession of areas of weakening transverse with respect to the longitudinal axis of said band is obtained by shearing, said areas including polygonal slots whose axis of symmetry is transverse with respect to said longitudinal axis, alternatively upset with respect thereto, and further including lighteners obtained on transverse straight lines passing through vertices, chamfered with relatively wide fillets, of said polygonal slots; and a second phase wherein said band is formed according to an open profile terminating, at its ends, with free edges. The invention further relates to the section bars obtained thereby.