Specification Package: 30Pcs 35mm Air Vents Hole Material: Stainless Steel Color: Silver Tone, Brushed Surface Design : Mesh Hole, Round Shape, Bevel Mounting Diameter: 35mm/1.38inch Total Size: 42 x 11mm/1.65 x 0.43inch(D*H) 1. The Air Vent is made of Stainless Steel, Long-lasting, and strong ability to withstand gravity, not only oxidation resistance, but also more beautiful installation effect. 2. Applied to places such as offices, meeting rooms, auditoriums, music halls, etc. Kindly Note: Please allow 1-2mm errors due to manual measurement, thank you for your understanding!