Bamboo Viscose Actual blind width is 47.5 inches. For an inside mount, fits windows 48 inches wide SIZING – The width includes a ½ inch deduction (window industry standard) from the size ordered. MOUNT - Inside mount, fits windows 48.0” wide. Outside mount, order ½ inch wider than overall area. EASY TO INSTALL – All hardware included for both inside and outside mounting for easy installation. LIGHT FILTERING – Lets in a small amount of light, even when closed, and cuts down on glare. CUSTOMIZE – Enjoy custom cut to size options available in 0.5 inch widths without the custom price.