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Choosing Double Glazing Handles It may seem like a small detail but choosing the right window handles can make or break the overall appearance of your double glazing. GB DIY Store offers a various styles and sizes. Espagnolette handles work with an insurance-standard multi-point locking mechanism within the frame of the window and are typically employed with casement windows. They are operated by a lever which turns a spindle, which locks onto a wedge-shaped striker plate. Espag Espag handles