... strong magnetism, filter scrap iron. diameter and length can custom-made. magnetic filter,magnetic bar, with ndfeb magnet, strong ... , filter scrap iron.composed: Ndfeb magnet, stainless steel, electric steeldiameter: Custom-made .Diameter often 19mm,22mm,25mm.32mm,and more ... sizes.length: custom-made. often 200mm,300mm, and more size.surface magnetism ...