Neodymium magnets use pot magnet design, make it more safe, stronger and more concentrated. Magnetic force is concentrated at the bottom, other three surface almost no magnetic. The vertical pull attraction is much bigger than the horizontal pull attraction. Magnetic force 10 times the volume of the same magnet. Protected by steel cup Magnet difficult to break, Strong powerful magnetic, compact, Force permanent, long service life. Widely used for magnet fishing, lifting, hanging, retrieving applications and industrial use. • +/-0.1mm tolerance • Each magnet can support a steel weight of up to 90kg vertically from the magnetic face when in flush contact with a mild steel surface of equal thickness and 18kg in a shear position • Removable eyebolt with M8 thread • Good Corrosion-resistance. Ni+Cu+Ni 3 Layer good corrosion-resistance coating, used both in fresh water and in marine. Steel shell can avoid the naked magnet from scratching and chipping. • Convenient to Use. The Neodymium Magnet comes with a eye bolt, just attach a rope and begin your magnet fishing and salvage. . • Search Little Item. You can search items like eyebolt, screws, hooks, fasteners and so on in your warehouse garage or yard. • Application. Great for salvaged of various iron-containing nickel material underwater and Good idea for magnet fishing, lifting, hanging, retrieving applications.