Works as a keyring for me. The locking mechanism appears to be effective in preventing accidental unlocking. Even in a simulated worst case where the clamp is pressed and rotated at the same time (e.g. somehow in your pocket) it only goes in slightly (not enough to form an empty gap). You have to intentionally rotate the stem to the middle position and then push in to unlock it. So it's not easy to use with one hand, but for my use as a keychain it doesn't mind. The weight and size are practical for a pocket. I've only had it a week, so I can't comment on durability. I would rather just buy 1 pack instead of 4 but overall it's still a reasonable price for something I use every day. I wish there were other color options.
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