There are Chinese versions of these that are made with a hex shank as opposed to the spline they normally have. Probably too make them cheaper but the side effect is that they are stronger. They can only clock into six positions but I find that enough. I bought these a long time ago but I think it was on aliexpress.These are nice but for light duty applications only . I replace these every night as the aluminum insides strips out easily . We have a bunch of gorillas tightening these things . They are used on friction locks for stops .
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