I couldn't use them on the drives I bought them for. The ring nuts fit the bolts and fit into the hole in the rim, but the key doesn't fit into the hole. The hole in the edge was big enough for the safety nut but not big enough for the wrench to slide on the outside. They appeared to be well made and there were no issues with the top half rotating. I've read that they offer minimal security and should be considered a deterrent. Maybe the thief will look for someone else's discs because they will slow him/her down a bit.
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