Made of heavy-duty zinc diecast housing, the CRL Tamper-Resistant 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 black finish matches your window frame. The hex wrench has a large key ring for hanging safely away from the window. One lock and wrench per package.