The screw-lift extraction systems are normally installed on the bottom of silos with a rectangular cross-section. Depending on the length of the storage and the flow of material required, one or two lifting groups are adopted. PMI has strengthened its experience by building machines for large-capacity and silos up to 10m width.

For applications with particularly abrasive materials PMI provides technologically advanced wear-resistant coverings applied to the transport surface of the spirals, on the areas concerning tubing and on the crumbling teeth fitted on the periphery of the screws.