Delta Blinds Supply Custom-Made, Premium Real Wood Horizontal Window Blinds, 2 Inch Slats, Chocolate (dark brown,) Inside Mount Actual blind width is 26 in. Fits inside a window frame that is 26.5 in. wide. The valance will be exactly 26.5 in. wide. ***IMPORTANT: MEASURING INSTRUCTIONS: To ensure you receive the correct size blinds please only use our measuring instructions for guidance (second photo on this page.) QUALITY: Warp-Proof in non-humid rooms; Lightweight Hardwood MATERIAL: 100% Premium kiln dried basswood from northern United States. CERTIFICATIONS: Greenguard Air Control and Greenguard Schools & Children FUNCTION: Heavy-duty components for smooth operation, higher load capacity, and enduring performance.