... 4.tolerance:+/-0.005mm --- +/-0.02mm micro precision magnet/watch movement rotor magnet/smco magnet Flygain Magnetic Co., Ltd. have ... micro hole process with all kinds of magnetic materials, precious stone, crystal ,ceramic and other metal and nonmetal materials. our ... deep-hole thin magnetic ring are widely used in watch, clock, micro-motor, meters, optical communication and other field. ...