Edge closure part (10, 11), especially for engagement on the edge of a glass plate (15) with two arms (1, 2) and a rib (3) connecting the limbs, wherein the arms (1, 2) and the rib (3) respectively form the side walls and the bottom of a groove (4), characterized in that one of the arms (1, 2) has at least one projection (7) Local directed towards the inside of the groove (4) and the rib (3) has, at the height of the projection, a weak point expandable.
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