This hopper type is often used for stable and regular feeding of secondary and tertiary crushers. Box-type bunkers, parallel to the ground parts of the floor, the corner of the material, the material is accumulating and the material remains constant here. Thus, the Hopper forms a stone surface in its interior. Since the feed material will flow through the accumulated stone, there is no abrasion at all. It is generally used in the feed of large material between 50mm and 300mm. Usually they can be used together vibro feeders and can also be used with belt conveyor feeders. It is manufactured between 20-40 m³ but it is possible to produce in suitable volumes and needs.