Jc renfroe model B1 beam clamp for lifting

What is for sale: Jc renfroe model B1 beam clamp for lifting

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Model B1 6 to 24 inch opening. 12 ton capacity. Two pictures of installed example are not the one for sale, just demonstrate how one of these products is used. It can be moved about on a beam rated for lifting objects straight up. Here is a link that provides an example, but the style in the link hinges, rather than pins together as this one for sale does http://jcrenfroe.com/app_pb.htm