Device (100) for riddling materials such as, for instance, inert materials arising from demolitions or the like or inert materials for the building industry such as gravels, sands or the like, comprising at least two riddling rollers or drums (103, 102), wherein at least one of them can be moved with respect to the other so that the distance between the axis of rotation of said at least two rollers or drums can be changed according to the needs and/or circumstances.
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