https://www.frontale.de/en/ausstellerprodukte/fenst22/product-10291216/symbio

Symbio : hidden hinge with a unique design. Symbio’s concealed door hinges remain flush with the wall mount and are easy to adjust on their 3 axes, allowing for a n aesthetically perfect thermal and acoustic insulation. Door can be adjusted vertically, transversely and in the depth on both the door’s frame’s side of the hinge. Symbio allows very fine adjustment of light (up to 3 mm) and air (up to 4 mm). To calibrate the light of the door, simply turn the Allen Key in the appropriate tappet, while to adjust the air simply regulate the bushings. Symbio’s patented adjusting mechanisms, and their simplicity of operation, are the result of Las Florida’s constant product research, development and innovation. Their hinges are tested for durability and guaranteed for a variety loads. Symbio hinges provide the widest choice of door frame distance on the market, and always allow a door to open 180 degrees, even with the thick frame or sashes.

La Florida is an industrial concern specialized in the pressing and turning of screw hinges, pivot and fitting for wooden and pvc furniture and door and window frames. Our new product: hidden hinges with a unique design, easy to fit and adjustable on 3 axes. The company in DNV ISO 9001 certified and has set up a research and engineering department for designing and prototyping new components, as well as continually improving its existing product range. All product are tested through each processing phase.