(57) Consituted by a closed profile which is provided with a "T" shaped rear area (3),
equipped with a web defined by two joined extensions (4) and (5), derivating from
an extension (4) and at 90°, a wing (6) with subsequently folds 360° over itself,
extending into an intermediate section (7) which projects from the web and folds again
390°, ending in an end section (8), including between said end section (8) and the
intermediate section (7), an end wing (9) which derivates 90° from the other extension
(5), which is provided on its edge with internal projections (11) against which teeth
(12) of the side edge of the wing (9) contact, the same also including a splined area
(16) in contact with another splined area (17) defined on the internal face of the
end section (8) which generates a balance stress in its contact which prevents the
turning of the tube when subjected to tension.
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