https://theflatearth.win/wiki/....Post:10_Double_Glazi
Types of Double Glazed Windows Handles UPVC window handles play a crucial role in the process of double glazing. They are used to control the locking and seal the window, which improves energy efficiency. Window handles from Espag feature a 7mm square spindle that connects to the frame with the multi point locking system. Both cranked and inline versions are available and can be turned either left or right. Espag Espag handles, the most popular window handle type can be used with espagnolette locks
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