186lbs Pulling Force: This magnets is 4in(36 mm) in diameter, adopt strong neodymium magnet for its base. It can offer 86lbs(39kg) pulling strength under ideal condition. 2Strong Magnetic Bottom: The powerful magnetic force is only concentrated at the bottom, The other three sides are protected by steel cups that almost no magnetic force and magnetic force equivalent to 10 times the volume of the same magnet. force permanent, long service life. 3Ni, Cu and Ni Triple Layer Coated: The best coating available, which provides a shiny and rust resistant coated steel cup provides protection for the magnet and helps to prevent chipping or cracking. 4Multipurpose: The unique design of countersunk head and chamfer is very suitable for fishing all kinds of iron and nickel materials underwater. It is also a good idea for fishing, lifting, hanging and recycling magnets. Have fun looking for screws, hooks, bras and other items in your garage or yard. 5Long Lasting: Neodymium is a kind of rare earth metal, it's suitable for making permanent and powerful magnets. This fishing magnet has permanent magnetism, it will be the same powerful even decades after.