1)Wind generator magnet specification: Grades: N30, N33, N35, N38, N40, N42, N45, N48, ... , block, ring, tile, arc, and ect. Tolerance: +/-0.05mm for small dimensions, +/-0.1mm for common specifications, +/-0.15mm for big ... years of experience and specialized in manufacturing sintered NdFeB magnet/motor magnet/speaker magnet etc. Certifications: ISO9001 &RoHS & SGS. Etc. Good after sales ...