A standard 3/8 inch deduction is made to the width for a proper fit. The actual blind size will be 54 5/8" W × 36" H, perfect for window 55" W × 36" H. The unique spring rod can extend 1 inch in total, allow the blind to fit for window sizeW54.7-55.6 X H36". No Drill Blinds: LazBlinds patented technology No Tools-No Drill system allow it no need to drill any holes on your window frame, great for Renter, Landlord, and Home Buyer. Easy to Install in 30 seconds with no tools-no drill, screws, or brackets. And it can afford maximum 2726kg. Fit All Kinds of Walls, like woodiness metope, tile marble, concrete wall and rough tile. 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. LazBlinds patented technology mechanical top-down/bottom-up stopper prevents the bottom rail from lifting the middle rail. By adjusting the position of the middle rail you can adjust the light and air circulation at will. Non-sagging 3/5'' cell structure not only provides a uniform appearance, but also insulate your home against outside thermal energy in summer and keeps outside cold away from your warm house in winter. Also, cellular blinds can reduce the noise from outside to provide you a better environment to work or sleep. REAL Blackout Shades: The silver-plated layer inside the cell can completely keep out the sunlight and uv ray. Offering a real dark environment, bringing you a good night's sleep during the day. Perfect for bedroom. LazBlinds No Tools No Drill Cordless Cellular Shades, Top Down Bottom Up (TDBU) Cellular Pleated Window Shades, Light Filtering Honeycomb Shades for Windows