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The opening restrictor with key for centre-pivot roof windows is a safety device designed to prevent the window from opening more than 10cm. It is suitable for VELUX centre-pivot roof windows with frame heights of 98cm and above. The restrictor comes with a key, which allows the user to lock and unlock the window as needed. This device is especially useful for homes with young children or pets, as it helps to prevent accidents and falls from windows. The opening restrictor can be easily installed and is a cost-effective solution for enhancing the safety of your home.