Home Hardware 25mm Bottom Diameter Metal Round Air Vent Louver Product Name : Air Vent;Design : Mesh Hole, Round Shape Color : Silver Tone;Material : Metal Each Hole Diameter : 3mm / 0.12";Upper Diameter : 8mm/ 0.31" Bottom Diameter : 25mm/ 0.98";Total Size : 34 x 12mm / 1.3" x 0.47" (D*H) Net Weight : 8g;Package : 1 x Air Vent