They are been used to lift and transport the steel and iron for factories,docks,ware house,transportation etc. 1.The safe coefficient of magnet lifter is 3.5. 2.Dimension can be changed without notice. 3.Dimension can be changed if client requiring. 4.Now we have A,B,C,D,E five types,we also can produce and design according customer's requirmnets. Now we have five types,from 100KG to 6000KG.