1. High water absorption: The window cleaner is suitable for single and double glass with a thickness of 18 - 30 mm. It's recommended to make sure the window thickness is in this range. You can clean the inside and outside of your windows while standing at home. 2. Clean both sides of the windows at the same time: You can stay in the room when cleaning the inside and outside windows with magnetic design. It's suitable for household windows, greenhouses, car windows, balconies, etc. 3. Before purchasing, please measure the thickness of the window glass. Measure the total thickness of the window frame, as well as the inner and outer thickness of the window frame. The actual thickness of the window frame glass = total thickness of the window frame - outer thickness of the window frame - inner thickness of the window frame. 4. The window cleaner is made of durable material. It's practical, sturdy, drop - resistant. When using it, be careful not to pinch your fingers, which is important. 5. Product size (length*height): 16*13.5*7 cm. The window cleaner is suitable for single and double glazing with a total thickness of 18 to 30 mm, not triple glazing. 6. If you're not sure about the thickness of your windows, it's suggested to choose a magnetically adjustable window cleaner from 4 to 30 mm.