Universal Dryer Vent Bird Guard: The universal dryer vent cage guard for fan fits most 3 inch to 4 inch dryer vents cover, Size fits most kitchen or bathroom exhaust vents/clothes dryer vent/bathroom fan vent. Great for Vent Protection: The dryer vent cover guard for bathroom fan vent is a great solution for vent protection. Using the exhaust vent animal guard to keep small animal and birds out of the dryer vents/exhaust vents while allowing airflow, no more small animals in the dryer vents. Not easy to fade&crack: Our dryer vent bird guard vent cover for dryer vent cover is made of heavy duty stainless steel, not easy to fade and crack, sturdy than plastic dryer vent bird guard, not easily chewed by animals. Easy to install: The outdoor dryer vent cage cover for bathroom exhaust vent is easy to install, package includes screws, just cover the entire dryer vent cover and tighten it with screws, and has plenty of room for the vent flap to open. Warm tips: Pls measure the size of the dryer vent cover before order the dryer exhaust vent cover guard for exhasut fan. Pls clean the lint or debris on the dryer regularly. Color: Silver Material: Stainless Steel Package Contents: 1 x Dryer Exhaust Guard 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.