These things are not very safe. You have a hex screw that should tighten the wire. My wires come loose quite often, and the dimensions of these things, they're very large, aren't really designed to be attached to anything. They're nice and heavy and pretty good quality, but like I said the wire is free to move so I just bought some crimp ends at the hardware store for a few bucks and crimped them myself. Much better.
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