Actual Blinds Size is 39 inch Width. Therefore make sure your window width is at least 39 inches or larger for an INSIDE mount. ?For outside mount we recommend Shades Width=your window outer frame width + (2-4)inch for better coverage. Cordless Blinds for Windows: The cord-free design provides a clean tangle-free look to the window and creates a safer environment for children and pets. Easy to raise up or lower down to gently filter sunlight. Easy to Install. Room Darkening Blinds: This will NOT be completely private. The unique weaving method of bamboo slats increase the shading performance. Perfect for bedroom living room dining room office. Due to the nature of real bamboo these shades are for indoor use and not for outdoor use or moist damp environments. Natural high-quality wild bamboo breathable keep the indoor air fresh and natural warm and beautiful. Since these shades are all natural small gaps between each flat material are normal and help gently filter light for a unique soft glow.