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The present invention relates to a mould (42) for bending material parts, the mould (42) comprising opposite first and second longitudinally extending mould halves (1, 21) enclosing a longitudinal mould cavity (59). The first mould halve (1) comprises a plurality of parallel first plates (2), and the second mould halve (21) comprises a plurality of parallel second plates (22). The first and second plates (2, 22) extend in width direction of the mould (42), alternate in longitudinal direction of the mould (42) and comprise respectively a first and second end wall (5, 25). Further, each first plate (2) comprises means (11) which co-operate with the bottom part (28) of an adjacent second plate (22) for restricting the canting of an adjacent second plate (22) in such a way that the second end part (30) would be moved in height direction of the mould (42), and each second plate (22) comprises means (31) which co-operate with the bottom part (8) of an adjacent first plate (2) for restricting the canting of an adjacent first plate (2) in such a way that the first end part (10) would be moved in height direction of the mould (42), when pressing a material part in the mould cavity (59) for the purpose of bending the material part