As someone who’s spent sleepless nights worrying about my curious toddler near windows, I can confidently say these Kamtop locks are a game-changer. The zinc alloy build feels sturdy—no flimsy plastic here! During testing, my 3-year-old couldn’t pry open our casement windows beyond the 19cm limit, though the heavy-duty cable did flex slightly under his determined tugging.

The white finish blends seamlessly with our UPVC frames, but installation revealed quirks. While screws went in smoothly on wooden frames, drilling pilot holes was necessary for our metal windows. Pro tip: Mark screw positions before mounting—the included template would’ve been helpful!

Where these truly shine is dual functionality: childproofing while allowing ventilation. We keep our bedroom window partially locked at night (hello, fresh air!) while the living room stays fully secured. However, the key system is frustrating—each lock has a unique key (contrary to some reviews), and losing one means wrestling with pliers like I did during testing.

Major red flag? They’re incompatible with window screens. Our Michigan friends returned theirs since local regulations require screens year-round. Also received one defective unit where the cable detached—concerning for a safety product.

For autism parents or families with climbers, these deliver peace of mind at an affordable price. Just don’t expect perfection—carry spare keys and check each lock’s function during installation. Despite flaws, they’ve become our home’s silent guardians against potential tragedies.