500x450mmm Rounded Sliding Windows Black Aluminum Alloy Frame UV Resistant with Movable Insect Screen for Caravan Camper Trailer RV for 48-53mm Wall Thickness Item Type: Rounded Sliding WindowsMaterial: Aluminum alloy + rubber + tempered glassOverall Dimensions: Approx. 530x480mm/20.9x18.9in Mounting Hole Size: Approx. 500x450mm/19.7x17.7in Applications: Tinted windows with insect screens protect your privacy and ensure that the sun does not heat the interior of your motorhome, fully sealed windows keep your campercold in the summer and warm in the winter, used in storage compartments, living rooms, lounges or anywhere windows are needed, can be used for your campervan trailer retrofit, etc Applicable: Suitable for camper, trailer, RV, mobile home, engineering vehicle and other locations that require windows