perforated metals are widely used in protecting from ambient noise where the highway,subway and railway come through the city, this kind of perforated metal meshes can also be used in building wall, power station and other source of noise in order to sound absorption.Irregular hole plate mesh is mainly used in foodstuff machinery, baking screen, decoration ceiling, cover of apparatus, speaker, filter and acoustic absorption etc. Light concave-convex hole mesh is used in platform, pedal, filter and all kinds of filtering valve etc.