The WM600 is suitable for all glass types up to 15mm thick, including safety glass balcony's and swimming pool surrounds. Window Mates are the “Original Australian Made” magnetic window cleaner. Their heavy duty durable frame encases specialized magnets designed for this specific use. The actual cleaning is achieved by placing a detergent and water soaked Window Mate on either side of your glass. Holding the handle and then sliding the Window Mates in the direction of the arrow (imprinted on the unit) will wash and dry both sides of the glass all in the one motion streak free, thus drastically reducing the time spent cleaning. Cleaning multi-storey building windows is no longer a problem, as the Window Mates are ideal for cleaning hard-to-reach outside windows (providing you have access to the exterior of the window) while remaining indoors. A safety cord attached to the external half of the unit provides protection against accidental dropping. It is important to note that the Window Mates completely eliminate the need for use of harmful chemical or toxic substances often associated with cleaning. All you need is water and washing up detergent and clean, sparkling, streak-free windows are only a step away!