The black lock was never opened. I've tried all three combinations as stated on the packaging, but I've never opened them. White worked, but overall the quality of these locks seems questionable. They rattle with every movement, and it seems everything from the dials to the iron handle is about to shatter. I will say I emailed the support service it says on the package and they told me they would send new ones for free. . However, I needed them for an impromptu ride and preferred to go without them because I had read some of the reviews saying they could break and I wouldn't trust them. However if they work great for you I will not trust this product and will use it (pictured is a 1 euro coin for size comparison)