differently from the pulleys, have only one part of the surface magnetized and are intended more to work independently.
Usually the material that must be deferized, come directly on the magnetic surface by one vibrating canal.
When the iron has been separated from the other material, is automatically detached from the magnetic cylinder by lists that move it to the not magnetized zone of cylinder.
All these products are builded on measure because usually have to be insert in yet existent machines.