Slotted seven louvered ventilators are perfect for marine boating. Our slotted ventilators are made from tough ABS Injected molded plastics to protect from discoloration. These Vents comes with pre-drilled holes and are sized to fit and easy to install. These are great for ventilating those enclosed areas. These slotted 7 louvered ventilators are available in black, white and mirror like chrome plastic options.