... , galvanized zinc. Nonmetal board: plywood, fiberboard, dense board and rubber board.Hole forms we can process are: round, slot ... hexagon, vertical crossing, plum blossom and leaf, etc. we can also manufacturing screen tubes and screen buckets of different diameters. The ... light diffusers, air diffusers, etc. Perforated metal panels and plates have varied uses from screening to ventilation. The ...