https://www.openlearning.com/u..../hyllestedcross-sl80
Security Features of Double Glazed Windows Unlike old wooden frames, modern double-glazed windows come with security features to make it difficult for burglars to open them. These include robust locking mechanisms and top-quality handles. Espag handles come with an auxiliary spindle in the back of the handle that is responsible for the multi-point lock inside the window frame. are extremely popular on uPVC windows. They are available in straight and cranked versions. H
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