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Choosing Double Glazing Handles It may seem like a small detail but choosing the right window handles can be the difference in your overall double glazing look. GB DIY Store has a large selection of different sizes and styles to choose from. Espagnolette handles operate an insurance-standard multi-point locking mechanism within the window frame and are typically used in conjunction with casement windows. They are operated by a lever which turns a spindle, which locks onto a wedge-shaped