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D&D, Leader in Commercial Door Hardware
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180 Degree Concealed Hinge

Often known as the invisible hinge, it is aesthetically pleasing as it provides sharp, clean and even gaps around the doors, and, is only visible when the door is open. They are supplied in various different sizes dependent upon door weight. They offer easy adjustment for precise and efficient installation and maintenance of doors; vertical, compression and horizontal adjustment.
Heavy Duty Hidden Door Hinge for Metal Door
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