A modular baler comprises a baling chamber; a displaceable pusher block in the baling chamber interior; a hydraulic cylinder comprising a cylinder rod displaceable into and out of a cylinder casing; a shear module; and wherein the baling chamber is attachable to the cylinder frame, with the cylinder rod attached to the pusher block. The baler fits in elevators unlike prior art. The shear module cuts material that is placed into the baling chamber. When the baling chamber is full, the baling chamber top is closed. Pressurized hydraulic oil flows into the cylinder rod, causing its longitudinal displacement, causing the longitudinal displacement of the pusher block which is attached to the cylinder rod, thereby compressing material in the baling chamber. The material is removed from the baling chamber, providing volume reduction of scrap waste metal over prior art.