Specialty invisible hinge for doors that have additional cladding or trim on top of the original door thickness which will allow the door to clear the framing and not bind. Will allow 8mm (5/16") worth of cladding, to allow for cladding up to 20mm (25/32") you must purchase the extension brackets HERE. This hinge is completely concealed when the door is closed. Adjustable in 3 dimensions after installation. Hinge opens a maximum of 180 degrees. Also known as a 3D hinge. Finger protection due to a small gap between door and frame. Hinges are sold individually. Weight rated for 264 lbs using two hinges. Hinges are cast in an aluminum alloy. The black plate that wraps around the hinge body is powder-coated steel. The cover plates are steel and are finished to match the 'knuckle' of the hinge. Burglar, fire, and smoke resistant, as well as soundproof. Optional Accessories (found under Related Products): Router Templates Universal Milling Frame Router Template Guide Router bits