perforated metal 1.material: Stainless Steel ,aluminum,galvanized iron,copper 2,hole:round,or as request 3. thickness:0.2mm ... used with advantage in many situations, for instance when requiring sound reduction, weight saving, air control, filtering, a decorative surface ... ,scale hole,it is strong and wear-resisting,artistic and tasteful.Usefulness:widely used in road,railway,civil building,water ...