Applied Magnets 5-pc, 3/4" Diameter, Strong NdFeB Neodymium Hook Magnets. 5-pc Hooks made with Strongest Magnet - Neodymium Magnet, 8 to 10 times stronger than ceramic hook magnets. Magnetic Hooks Size: 20mm or 3/4" Diameter x 37mm tall with M4 threaded hook attached. Steel cup offers protection for magnet and make the magnetic force concentrated on the magnet surface. Industrial applications such as fastening, holding, hanging objects, etc. Approximate Pull Force: 34 lbs. Pull Force is the amount of force required to separate 2 of the same size magnets from each other.