Made of thickened 304 stainless steel, thickened, corrosion-resistant, rust-proof, anti-deformation. 45° inclined louver design, prevents rainwater backflow, cockroaches and rodents. Rounded edge, not easy to hurt your hands, detachable and easy to clean. Vents are suitable for ventilation systems, household wall vents, air conditioning systems, kitchen vents and industrial purposes. Contains 1 circular ventilation grille screen with an inner diameter of 100mm., Weight: 0.2094391489 pounds, Manufacturer: QWORK