... 1. With outter screw 2. Magnet and iron shell,shining surface 3. more size can be custom-made round magnets with screw holes material ... area, like speakers, headphone, mobilephone, receiver, microphone, audio equipment, motors, wind generators, sensors, leather, toys, package etcThe ... RoHS certified.5) Use of magnetOur magnets are used for motor speaker, hardware, package, cabinet lock ,door lock ...