manufacturer_minimum_age : 120 monthsPractical Design They are amazingly wonderful for their size and have innumerable uses.It is Ferrite Magnetic hook, Grade 5.Data based on scientific measurementVertical Tension: 22 lbsHorizontal Tension:7 lbs1. We used A3 high quality steel as the test floor.2. After many measurements, we have obtained scientific and rigorous measurements by pulling the hook at a uniform speed on professional equipment.It is Ferrite Magnetic hook,Grade 5.Several Important Factors Affecting the Tensile ForceSeveral Important Factors Affecting the Tensile Force1.Only when the thickness of the tested steel reaches a certain level, the tensile energy can reach the ideal value.2.Only when the force is perpendicular to the contact surface can the tension reach the maximum. When the force is parallel to the contact surface, the pulling force can only reach 1/3 maximum.3.It can not attract aluminum, copper, wood, plastics and stainless steel.4.The farther the magnetic hook is from the material, the smaller the pull force would be. Therefore, the surface paint adsorbed by magnetic hook is also an important factor affecting the pulling force of magnets.