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Choosing Double Glazing Handles The window handles might appear to be a minor thing however, they can add or break the look of your double-glazed. GB DIY Store has a large selection of different sizes and styles to pick from. Espagnolette handles are used to operate a multi-point locking system that is used to secure security within the frame of the window. They are most commonly employed with casement windows. They are operated by a lever which is controlled by a spindle w