Butterfly Hang Piece

At present ,the arrowfish Notching and Pinning Dry hang system is the most widely used dry hang art which embeds a butterfly or T shape hang piece with notching in the plumb direction of the stone thickness, it should used with the epoxy adhesive at the same time, it is mainly suits for the stone  curtain wall dry-hang, But it can't form a large-scale prduction and it's of bad quality control.