FIELD: metallurgy. SUBSTANCE: invention relates to metallurgy and can be used in bulk materials processing by pressure. Proposed roller assembly comprises press arranged on press bed to rotate in opposite directions first and second rolls. Rolls are made in the form of regular prism and are installed with the possibility of arrangement opposite to each other with gap of side ribs of prisms. Briquette is formed by faces of prisms and separated from mass of loose material by side ribs of prisms. EFFECT: as a result, roll assembly design is simplified.