hole punching shapes: rectangular, square, circular, angular, scale-shaped Opening Dia. : 0 ... , zinc plate, aluminum molded plate etc.Opening shapes: rectangular, square, circular, angular, scale-shaped etc, Opening Dia. : 0 ... Openin Dia: 0. 3mm-25mmProcessing: the punched hole metal mesh, used to be in filteration & ventilation, set foot in ... , enviroment friendly, beauty etc, hole punching mesh