Round Stainless Steel Air Flow Ventilation Louver 65mm Upper Dia 5 Pcs It usually takes around 1-4 Weeks Time to deliver after Item has been Dispatched. Please Check the Delivery Time Before Making Purchase(s). Stainless steel material, perforated, round mesh hole.Can make the wind easily flow into the spaces where you are staying.Applied to places such as kitchen, offices, meeting rooms, auditoriums, music halls, etc.