Stainless Steel Grid Hole - With the honeycomb design. round holes are perfect for breathable design - Stainless steel ventilation grille small round holes can be dustproof and not easy to block.Round stainless steel ventilation grille easy to install Open the legs and press the ventilation opening so that it fits snugly. You don't need to exert too much force and you don't need any auxiliary toolsRound ventilation grille ideal for ventilation pipes. ventilation pipes. extractor hoods. air conditioners. kitchen fans and ventilation openings. all ventilation openings on the wall. heatThe air exhaust grille the circular net allows the wind to circulate freely in the room and provides you with a cool and odor-free living and working environment.The air hole can be mounted directly in the hole of the same diameter with a base diameter of 25 mm and an outer diameter of 35 mm