Made of heavy-duty zinc diecast housing, the CRL Tamper-Resistant Lock, securely locks your window in a closed or ventilating position. Utilizing a hex security screw and wrench, the lock 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. Two locks and one wrench per package.