1Upgrade Insulation Bridge Insulation Technology: Adopting high tech bridge insulation technology to effectively isolate indoor and outdoor temperatures, maintain indoor temperature comfort, and save air conditioning energy consumption. 2Ventilation Limiter Design: The window is equipped with a ventilation limiter with a key, which can fix the opening degree of the window, maintain air circulation, and prevent sudden strong winds from pouncing on the window. 3One Lock For Multiple Purposes: Window locks can be opened both internally and externally, making them easy to use and particularly suitable for inconvenient operators such as the elderly and children. 4Child Proof Window Lock: The window is equipped with a child lock to prevent children from accidentally opening the window and improve family safety protection. 5Beautiful and Generous: Open outside, open inside window free conversion, and all kinds of home decoration style harmonious integration, improve home taste. Specification Item Type: Casement Window Hinge Material: Stainless Steel Package List 1 x Ventilation Limiter 1 x Key 1 x Hex Wrench