Totally buying these at home depot or some place, 1) because it's a great safety tool for the twins, and 2) i can allow air flow into my apt during the summer without the risk of burglars opening the window all the way to get in!
The Aluminum-Plated Snap-On Sliding Window Lock is constructed from steel and plated with aluminum. It features a unique snap-on design that requires no tools for installation. This lock is designed to provide excellent ventilated locking.
The Defender Security Sliding Window Lock With Double Thumbscrews securely locks windows in a closed or ventilating position. The lock features 2 thumbscrews for additional gripping power....Learn More
Prime-Line Products U 9800 Sliding Window Lock, Steel Screw, Mill Finish,(Pack of 2) Securely locks sliding window in closed or ventilating position Utilizes single thumbscrew to mount on window track No tools needed to install Zinc diecast construction