SUNKEE (3-pack) Magnetic Hook,88 Pound Strong Neodymium Magnet Hooks, Ultra Heavy Duty Magnetic Hook,1.42" Diameter, 1.8" Total Height Material:Strong Neodymium magnet + A3 steel + M6 Screw thread hook Theory of vertical force:88 Pounds (40kg) The theoretical level of tension:11Pounds (5kg) Size: 1.42"x1.8" (Diameter*Height) Working temperature: 175F (80) Application scope: containing iron nickel material panel,The magnetic circuit of A3 steel and magnets made,magnetic force is developed to the maximum,at the same time protect magnet not easy rto broken Adsorption on the refrigerator and put the key. Adsorption in any place where have metal and can hang items