Upgrade your cabinets with these high - quality concealed hinges They are designed with a cup depth of 11.5 mm, screw holes 45 mm apart, and opening angles of 85° and 105°. The door thickness range of 14- 22 mm makes them suitable for most cabinet door styles, especially frameless cabinets. Each hinge comes with 2 easy - on dowels and 4 self - tapping wooden screws for easy installation. The built - in POM damper in each hinge reduces closing speed, preventing kitchen noises and protecting your fingers. You can stop the cabinet door at any angle after opening it more than 45°, and it self - closes when the angle is less than 45°. The 3D adjustable feature allows for easy adjustment of the cabinet door, ensuring proper alignment and smooth operation. These hinges conform to ISO9001, ISO14001, and SGS standards, and can withstand over 80,000 times of opening and closing and 48 hours of salt - spray test. Ideal for kitchen cupboards and other cabinet applications, they bring convenience and reliability to your daily life.