... 4.no burr on the back Diamond Holes Perforated Metal Sheet(sample free)1.Material: Cold Steel Plate, Stainless Steel Plate, Aluminium Plate, galvanized Plate, ... length is 2.5 meter, Different shapes of holes can be punched; Like Round, Square, Club, Hexagonal, Oblong and so on. ... We can produce non-standard types of holes as customer requirements ...