SkyMaxx Large Roof Vent 500 by 700 Roof Thickness 42-60mmSpecification:Manual lift with 3 open positionsPleated screen & blind offers multiple shade optionsFits 700 x 500mm roof openingForced and non-forced ventilation, by having interchangeable panels they can be both vented and non vented which suits either vehicles,motorhomesor caravans.For 42 to 60mm roof thicknessNo cutting or adapters requiredCE & R43 approval/ROHS compliantScrews supplied for installation