Blinds width will 3/8" narrower for a snug internal installation. Actual blinds size is 21.625"W x 36"H. Choose the size SAME or CLOSEST to your window width for INSIDE mount. For Example, if your window width is 30 inch, 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. Room Darkening & Moisture-Resistant: 180° tilt wand adjusts slats to filter light, block UV rays, and provide privacy while maintaining a sleek, modern look. Made from durable vinyl, these blinds resist warping and fading in high-humidity areas like bathrooms, kitchens, and basements. Cordless Blinds: Cordless operation eliminates hazardous cords, creating a pet-friendly and kid-safe environment while maintaining effortless light control. Easy to Install: Includes all the hardware you will need with simple instructions to make installation easy and convenient! Features mounting brackets designed for inside, outside, or ceiling installation. (Pls Note) For INSIDE mount, window frame should have at least 1 2/5” depth. Please read the picture to learn the light gap may happen on the window. Any questions please feel free to contact us: CustomerService@coprisma.com, and we will respond to you within 24 hours.