Steel Material: The cabinet hinge is made of high quality cold rolled steel, rust and corrosion resistant, good hardness, precision design to ensure long use time. 90/180 Degree Opening Angle: The hidden hinge can fold from 90 degrees to 180 degrees. It uses a special mechanism to slowly close the furniture to achieve smooth movements without creating annoying noises. Easy to Install: 16 pieces of screws are also provided, all you need is a screwdriver to complete the installation. It can be installed on the corners of furniture without damaging the surface. Multipurpose: The hidden hinge is suitable for doors, cabinets, tables, kitchen doors, wardrobes, bookcases, wall brackets, bedrooms, balconies, bathrooms, gardens, offices, etc. Size: The size of the door hinge: 6.8 x 6.8 x 2.2 cm, the screw size: M4 x 16 mm. Enough to meet your installation needs. Very compact, it takes up very little space.