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Choosing Double Glazing Handles It may appear to be a minor detail but selecting the correct window handles can be the difference in the overall appearance of your double glazing. GB DIY Store offers a various styles and sizes. Espagnolette handles are used to operate a multi-point locking mechanism that is used to secure insurance in the window frame. They are most commonly used in conjunction with casement windows. They feature an operating lever that turns a spindle which locks onto the striker plate in a