Durable Material: Air Vent Made from 316 stainless steel material, polished surface, corrosion resistance, sturdy and durable to use. Size: Round Air Vent measures 125mm(5inch) in diameter, 4 drill holes(3.5mm), easy to install; and the air volume is adjustable to meet your needs. Adjustable ventilation: Our Incoming air can be used for indoor exhaustion. suitable for heating or ventilation of a boat, mobile home or caravan, Adjustable ventilation, change of fresh air according to your needs. Application: The round ventilation grill 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 ventilatedoptimally with these ventilation roses. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.