Strong Absorption: The window cleaner is effective for single and double glazing with a thickness of 20-30 mm. Make sure your window pane is 20-30 mm thick. You can clean both the inside and outside of the windows by just standing at home. Cleans Both Sides of Windows Simultaneously: Through the magnetic design, you can stand indoors and clean both inner and outer windows at the same time. It is very suitable for family windows, greenhouses, windows, balconies, etc. Measure the thickness of your window glass before purchasing. Measure the total thickness of the window frame and the inner and outer thickness of the window frame. Actual window glass thickness = total thickness of window frame - outer thickness of window frame - inner thickness of window frame. Ultra High Quality: Ultra-strong ABS, Alnico iron boron and rubber band. Comfortable, robust, fall-proof and durable. It is very important that you do not pinch your fingers when using it. Product Size (L* W* H): 130*150 mm. Window cleaners should be suitable for single and double glazing with a total thickness of 20-30 mm, not for triple glazing. If you are not sure about the thickness of your east window, we recommend choosing an adjustable magnetic windshield washer from 4 to 35 mm.