The present invention relates to a slide suitable for guiding a roller shutter apron for a building bay. At least one of the free edges (431) of the slide (4) is extended by a first lip (5) curved towards a transverse wall (42) to cooperate with a complementary hook (312) fitted to a lateral edge (311) of the roller shutter apron (3) and to strengthen the retention of said roller shutter apron (3) within said slide (4). The first lip (5) is made in one piece with the free edge (431) and in at least one second plastic material which is different from the at least one first plastic material. Figure for the abstract: 2
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