These clamshell vent covers give a new slant to an old favorite. Their unique sweptback styling updates this necessary finishing touch for a sleek contemporary look. Made from white UV-resistant ABS plastic, these covers are durable and strong enough to stand on. They have been designed in three popular sizes to cover 1-1/4", 2" and 3" vents all with pre-drilled holes for a smooth screw on installation.