The invention relates to a flat aerodynamic windscreen wiper blade (1), in particular for a vehicle, characterised in that it comprises: a longitudinal wiper blade (8); at least one longitudinal stiffening strip (6); a longitudinal member (7) for retaining the wiper blade and the stiffening strip; and a longitudinal shroud (2, 3) including two end caps (3) and a central mount (2) extending between the end caps and being connected thereto, the mount comprising means for securing to the stiffening strip or to the strip-retaining member.
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