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Choosing Double Glazing Handles The window handles might seem like a minor detail however, they can add or ruin the overall look of your double glazing. GB DIY Store has a great range of different styles and sizes to pick from. Espagnolette handles are used to operate a multi-point locking mechanism that is used for insurance in the window frame. They are most commonly used in conjunction with casement windows. They are operated by a lever which turns a spindle, which locks onto a wedge shaped striker plat