What else can I say about this clamp other than I love it!! These are a very well built clamp and can hold an extremely impressive weight. I have just one of these fitted to an Omega bracket for a Martin Mac 250 and they have never given me any bother. They are robust, durable and will last a lifetime. All you have to do is hang it on the truss, tighten and it won't go anywhere.
The only downside is the supplied bolt and butterfly nut. I had to replace them with slightly longer bolts and lock nuts as it was a struggle to fit them to an Omega bracket.
Other than that, highly recommended