... ± 0.01mm (common difference). Its generally 20% of material thickness.6. Product quantity: 4000 square meters per month. ... , etc), Copper, Silicon steel plate, Aluminum, nickel, Magnetic material and so on. The main technologies include Precise etching, Precise stamping ... , Precise mechanic processing, electroforming and electroplating and so on. Metal Coated Mesh Speaker Grill