Okay, so I bought these sliding window locks hoping they'd be the ultimate child safety solution. Let me break it down for you.

The GOOD: The zinc alloy feels super sturdy - like it could survive a zombie apocalypse. The key separation design is genius for keeping curious kids out. I also love that it works as both a child safety device AND anti-theft measure.

The BAD: Major sizing issues! Like other reviewers mentioned, mine wouldn't lock properly on the window sill either. The 3-6mm clamping distance is VERY specific - measure twice before buying!

PRO TIP: These work best if your windows have the exact right gap. Mine didn't, so they're just sitting in my junk drawer now. Maybe good for thinner window frames?

Final verdict: 3/5 stars. Great in theory but execution depends entirely on your window type. Would only recommend if you can confirm measurements match perfectly.