It was designed for use in glazing and curtain wall applications where no hole would be drilled through the glass. The structural members are glued to the glass instead of fastened through it.
The bottom side of the button is glued to the face of a glass panel at the glass manufacturers plant. The bolt is then placed into the bottom and the top half screwed into the bottom half at the job site. The bolt would be able to rotate in the button to attach to a support frame. This is for free flow artistic glass panel designs.
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