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The protective coating on the picks started wearing off seconds into use on the practice lock. The practice lock pins are poorly fitting, don't move easily and get stuck extremely easily, making this a poor lock to practice on. Once open, the lock cannot close again without using the key. The picks were starting to bend, as was the tension wrench, which also lost a bunch of protective coating just opening the practice lock a single time. I recommend you spend a bit more money and get something that isn't going to break on first use.