Adjustable ceiling ventilation made of high quality stainless steelOuter diameter 125mm - drill holes 3.5mm - for vent pipe 100mm - material thickness 1.0mm Made of high quality stainless steel, eco-friendly, safe, sturdy and durable to use. /p> Easy to install Simple round wall air outlet The ventilation plates are easy to assemble with their 4 drilling holes. Very easy to install and the air volume can be controlled to suit your demand using our handy vent control valve. . Adjustable ventilationCan be used perfectly for indoor burnout, less noise, and can also be used to decorate. Perfectly suited for heating or ventilating a boat, mobile home or caravan You want to supply a room with fresh air as needed, so you've made the right choice. Sleek and modern, easy to clean Simple design, fashionable appearance, fine workmanship and excellent quality. Can be perfectly installed on the ceiling or on the wall, also very easy to disassemble for easy cleaning. Ideal accessory For professional grillers and smokers, sailors, campers and anyone who needs adjustable ventilation. Heat can be generated depending on the food being grilled. Even garages can be optimally ventilated with these ventilation rosettes. Stainless polished surface.