Blinds width will 1/5" narrower for a snug internal installation. Actual Blinds Size is 19 4/5" x 72" H. Choose the size SAME or CLOSEST to your window width for INSIDE mount. For Example, if your windows are 30" wide, order 30" or slightly less for internal installation. For OUTSIDE mount, we recommend order (2-4)inch wider than your window width for better coverage. For Example, if your windows width is 30", order size 34" would be okay for outside mount. (Pls Note) Fabric width is 1 4/5" narrower than the shades. For INSIDE mount, window frame should have at least 1 1/5” depth. Shades height can adjust from 0" to 72". No Drill Blinds: 2 sets of different mounting accessories to meet your needs in different occasions. Easy to install in minutes with foam glue or brackets and screws. Great for Renter, Landlord, and Home Buyer. Details of Installation Manual are Included in the Package. Please feel free to contact us by Amazon message if you have any questions, and we will respond to you within 24 hours. Cordless Blinds for Windows: The cord-free design provides a clean, tangle-free look to the window. Smooth and quiet glide spring system creates a safer environment for children and pets. Easy to raise up or lower down to gently filter sunlight and stay at whatever position you stop. 100% Blackout Roller Shade: Blocking out 100% light for complete privacy, energy saving insulates against heat and cold, light control and UV protection for bedrooms, children’s rooms and movie rooms. Excellent for deeper and longer sleepers.