Made of heavy duty cast aluminum, the Tamperproof Window Lock securely locks your window in a closed or ventilating position. Utilizing two hex security screws and wrench, the lock provides super gripping strength and is unable to be accidentally opened by children. The lock is easy to install. Simply place it in the window rail and attach. The aluminum finish matches your window frame. The hex wrench has a large key ring for hanging safely away from the window.