Durable Material: Air Vent Made from 316 stainless steel material, polished surface, corrosion resistance, sturdy and durable to use.Size: the Round Air Vent is measures 125mm(5inch) in diameter, 4 drill holes(3.5mm), easy to install; and the air volume is adjustable to meet your need.Adjustable Ventilation: Our Incoming air can be used for indoor exhaust. suitable for heating or ventilating a boat, mobile home or caravan, Adjustable ventilation, fresh air change according to your needs.Application: The round ventilation grille can be used indoors as well as outdoors for anyone who needs adjustable ventilation. Heat can be generated depending on the food being grilled. Even garages can be optimally ventilated with these ventilation roses.When shopping, please pay attention to the size and dimensions of the product to ensure that it meets your needs. In the title and , we have provided detailed information about the product, including its features and specificationsWe want you to be completely satisfied with your purchase, so if you have any questions or concerns, please don''''t hesitate to contact us. We are here to help and will do our best to assist you.Thank you for choosing our product. We hope you enjoy it