I recently installed the 70mm copper lock cylinder on my wooden backdoor, hoping for a sturdy upgrade. The installation was indeed straightforward—just unscrew the old one and slot this in. The copper build feels solid, and the silver finish gives it a clean, professional look.

However, the real test came when using the keys. Unlike my old lock, this one requires some 'persuasion.' The keys don’t slide in smoothly; they often catch halfway, needing a wiggle or extra push to engage fully. It’s frustrating when you’re in a hurry or carrying groceries.

For casual use (like my backyard shed), it’s passable—once locked, it holds firm. But for high-traffic doors? I’d hesitate. The inconsistent operation makes me question its long-term reliability. If you need daily smoothness, spend a bit more. This one’s better suited for low-stakes spots.

Bonus: The three keys are handy, and the rust-proof claim holds up—no tarnish after weeks of rain.