1、3 LAYERS COATING: Our magnets feature three layers of nickel, copper and nickel plating to reduce corrosion and provide a smooth surface. 2、DURABLE: Our strong magnetic magnets will not break in normal use because the magnets are protected by the internal steel cups, which greatly improves the service life of the magnets. 3、MAGNETIC STRENGTH: Our powerful magnetic magnet is made of NdFeB and stainless steel, compact and lightweight, with strong suction force. 4、308.6LB PULLING FORCE: Our magnet has a super strong magnetic force, up to 308.6lb, which can attract all kinds of iron containing nickel materials. 5、APPLICABLE SCENE: Our powerful magnetic magnets are suitable for home, office, classroom, school, science, adults, children's science, fun decoration. 2 x Countersunk Hole Magnet Item Type: Countersunk Hole MagnetMaterial: NdFeB, stainless steelColor: SilverSurface Plating: Nickel PlatingWorking Temperature: 80℃Use: Suitable for home, office, classroom, school, science, adults, children science, fun decoration.