https://click4r.com/posts/g/18....203016/a-time-travel
Security Features of Double Glazed Windows In contrast to wooden frames of the past, modern double-glazed windows have added security features to make it difficult for burglars to open them. These include high-quality handles and strong locking mechanisms. Espag handles come with a spindle on the back that triggers a multi-point lock that is attached to the window frame. They are extremely popular on uPVC windows. They are available in cranked and straight versions. High-Tech Loc
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