1、Kit Information: Includes 2 round mesh covers, 1 square mesh covers, 1 rectangular mesh covers, 2 mounting calipers, 6 springs, perfect for your application! 2、Security Protection: Large enough clearances both ensure ventilation and avoid the entry of flying bugs, protecting your furnace and fan from pests. 3、Stainless Steel: Heavy duty stainless steel mesh vent screen for maximum strength and longest service life, rust resistant for outdoor use. 4、Precision Craftsmanship: The exhaust vent mesh cover is finely designed to effectively optimize air circulation and provide a more comfortable living environment. 5、Simple Installation: The set is simple in design and easy to install, no professional tools are needed, you can easily install it by yourself, saving time and energy.