... I ,SS Technical:perforated black cross perforated metalHole punching metal :1. Hole Punching Metal Mesh Material: Low carbon steel board, stainless steel ... grain storage ventilation, mechanical protection5. Hole patterns of Hole Punching Metal Mesh: Round, Rectangular hole, square, Triangle, Diamond, Hexagonal, oval, ... shapes, also other special shape according To your request! perforated metal plate