Do the selections magnetism rollers coordinate a belt conveyor, the magnetism iron mine being used for metallurgy broadly gets rid of stone, mark of ore, grain processing, cement building industry gets rid of iron, metallurgy industry metal reclaim etc., have the function is good, the magnetic field is high, cost is low, life-span is long, installation is put into use going to the lavatory, beneficial result waits for merit obviously, depths accept extensive consumer favor.