... -plate, Fiber Glass, PVC plate, Composites. ∩ Hole shape: Round, Square, Slot, Triangle, Long round, Scale, Diamond, Oval, Hexangular, etc. ∩ ... noise control, pharmaceutical, filtration, etc. ∩ Delivery: The perforated metal sheets are delivered by EMS, express company, the truck, railway ... as follows: ∴ Material ∴ Hole shape∴ Diameter: the size of the holes∴ Hole pattern: staggered or straight∴ Pitch ...