[ Stainless Steel Material]These ventilation grilles are made of high-quality stainless steel, which is strong and . They can withstand various weather conditions and will not rust. [Effective Insect Prevention]These grilles are designed with fine mesh to effectively prevent six-legged bugs from entering your room through the flange. Enjoy an insect-free environment. [Promote Air Circulation]By installing these grilles on the exterior wall, you can that the air circulates properly indoors and outdoors. Enjoy fresh and healthy air. [Easy to Install]Simply insert this product into the round hole on the exterior wall. For added stability, it can be fixed with glue or cement. The installation is simple and worry-free. [Wide Application]These grilles are suitable for a variety of applications, including residential, commercial and industrial environments. They provide a practical solution for ventilation needs. Colour:As Shown Material:Stainless steel Package Contents: 4 x Ventilation grilles Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.