Material:Low-carbon sheet,Stainless Steel Sheet,Aluminium Sheet,etc Process:Perofrated. Surface Treat:Galvanized,Coated ISO Professional Micro ... , beautiful, strong and durable, wide application. 6.Specifications: Coil sheet 1X20m, flat sheet 1X2m. 7.Hole Patterns including: Round; Rectangular hole; Square; ... ventilation, grain storage and machine protection Professional Micro Hole Perforated Sheet