... bearings Synthetic white corundum specializing in incising,grinding and drilling micro hole process with all kinds of magnetic materials, precious ... hole thin magnetic ring are widely used in watch,clock,micro-motor,meters,optical communication and other field. Also we can make ... . High performance NdFeb magnets (N50, N52, N45SH), with machining micro cylinder magnets of dimensions of 0.4mm x 0.2mm ...