High-quality material: These window restrictors are made of high-quality carbon steel, with a white coating on the surface, which is sturdy and durable, rust-proof and wear-resistant. Ventilation: Casement window restrictor, The controlled supply of fresh air can effectively prevent moisture penetration and mold growth. Even in cold or rainy weather, the indoor climate can be perfectly regulated. The opening width can be adapted to the weather conditions and your habits. Adjust the opening: Our window restrictor allows you to adjust the opening angle to lock the window in different positions and prevent accidental closing. Suitable for casement and sash windows, made of wood or metal, and is easy to install. Easy to install: This window restrictor comes with screws, the window is installed to avoid drilling holes near the new window. You can also use the provided screws to install them for double security. The special removable design makes it easy to change the opening position of the window to secure the window over small distances.