[High Quality Stainless Steel Adjustable Ceiling Ventilation] 125mm outer diameter - 3.5mm drill holes - for 100mm ventilation pipe - 1.0mm material thickness Made of high quality stainless steel, environmentally friendly, safe, sturdy and durable to use.[Easy to Install Single Round Wall Air Outlet] The ventilation plates are easy to assemble with their 4 drill holes. Very easy to install and the air volume can be controlled to meet your demand by using the control valve of our wind, practical.2 pieces - regulator on the side - adjustable stainless steel fan flies or other insects become annoying.[Adjustable Ventilation] Can be used perfectly for indoor exhaust, 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 according to your needs, so you are making the right choice. [Elegant and modern, easy to clean] Simple design, fashionable appearance, neat workmanship and excellent quality. Can be perfectly installed on the ceiling or wall, also very easy to disassemble for easy cleaning. [Ideal accessory] For grill and smoker professionals, sailors, campers and for anyone who needs adjustable ventilation. Heat can be generated according to the grilled food. Even garages can be optimally ventilated with these ventilation rosettes. Polished stainless surface.