Let me start by saying these window locks are a total steal for the price. I installed them on all my sliding windows and patio doors, and the peace of mind they provide is incredible.

The aluminum construction feels sturdy yet lightweight, and the vinyl lining is a genius touch - no scratches on my window frames after months of use. What surprised me most was how discreet they look when installed.

Installation was a breeze (took me about 5 minutes per window). Pro tip: remove the rubber insert first to slide the lock into position, then pop it back in. The thumb screws are good, but using pliers for that final tighten makes them absolutely immovable.

I particularly love using these with my window AC unit - they keep it securely in place while still allowing me to adjust ventilation. The locks hold so firmly that even when I intentionally tried to force my windows open (for testing!), they didn't budge an inch.

My only minor gripe? The rubber inserts can be tricky to handle during installation - I nearly lost one. But once properly seated, they stay put perfectly. For maximum security, I recommend installing two locks per window (one on each side).

After trying various security solutions, these are by far the most effective no-drill option I've found. They've become an essential part of my home security setup - especially important since we have young kids who like to explore windows.