Modern design air vents maximize cooling performance by increasing airflow to prevent your computer from overheating. The hollow ventilation design quickly dissipates heat, provides effective dust protection, and prevents the computer from overheating. Cover open PCI slots with these standard steel PCI expansion vent cover brackets. 5-piece ventilation baffle, perfect replacement for PCI cover dust filter ventilation, suitable for PC computer case. The full-contour PCI cover bracket fits most common PC tower cases. Made of high-quality steel and stamped with high-precision molds, it is durable, high-strength, non-deformable, has a black surface, is rust-proof, and corrosion-resistant. Tool-free installation, quick and easy installation using 5 tool-free mounting screws for easy installation and removal. Full-size design, standard height, fits most computer cases and is easy to install. Note: The data are all manually measured, please allow 1-3cm error. Due to differences in light and