60mm diameter x 61mm high The internal diameter of the hook is 11mm and is 46mm from the tip of its thread to top Each magnet can support a steel weight of up to 120kg vertically from the magnetic face when in flush contact with a mild steel surface of equal thickness Removable hook with M8 thread Coated with three layers of nickel, copper and nickel to reduce corrosion and provide a smooth finish These large clamping magnets provide an astonishing 120kg clamping force. The Neodymium magnets are sunken in to a steel shell meaning that the north pole is on the centre of the magnetic face and the south pole is on the outer edge around it. The steel pot increases the adhesive force of the magnets giving them an incredible hold for their size. An added advantage of these magnets is that they are resistant to chipping or cracking following constant impact with a steel surface. These magnets come with a safe-handling warning; because they are so powerful they can be dangerous if not handled carefully.