... square hole metal ISO9000:2008 Material:aluminum ,low carbon steel ,G I ,SS Technical:perforated,punching make squrae hole metalHole punching metal :1. Hole ... and grain storage ventilation, mechanical protection5. Hole patterns of Hole Punching Metal Mesh: Round, Rectangular hole, square, Triangle, Diamond, Hexagonal, oval, Cross ... special shape according To your request! make square hole metal mesh