1. With outter screw 2. Magnet and iron shell,shining surface 3. more size can be custom-made round magnets with screw holes material: ... magnetized, axially magnetized, and multi-pole axially direction.2) Product typeWe can supply block (huge and small), thin disc ... hole), segment, tile, and ball types of magnets, and also include special magnetic-bar, magnet with iron-shell, adding water-proof pvc ...