Fit for Various DoorsCompatible with doors up to 850mm (33.5 in) in width and 2286mm (90 in) in height, with a minimum door thickness of 35mm-40mm (1.38-1.57 in). The hinges are designed for a 180 opening angle, ensuring smooth and silent operationComplete Installation Kit2 * 180 Degree Opening Hidden Hinges8 * Flat head screw16 * Self-tapping screw3 * Adjustable wrench8 * Hinge CoverZinc Alloy ConstructionCrafted from quality zinc alloy, these hinges offer exceptional corrosion resistance, good to use, and strength, making them ideal for heavy-duty door installations. The material ensures long stable performance even in demanding condition3-Way Adjustable DesignThese hinges offer three-dimensional adjustability for precise alignment: Vertical adjustment: 3.0mmHorizontal adjustment: 2.0mmDepth adjustment: 1.0mm. This feature ensures a perfect fit and smooth operation for any door typeHeavy-Duty Capacitywith a pair capable of handling doors up to 40kg (88.18 lbs). Suitable for wooden doors, fire doors, soundproof doorsInvisible & Modern DesignThe concealed hinge design ensures that no hinge pins are visible when the door is closed, providing a sleek and modern appearance. Suitable for both left-hand and right-hand doors, these hinges are for hidden doors, secret doors, and modern interiors, including: Wooden Doors, Swing Doors, Aluminum Doors, Fire Doors, Soundproof Doors, Anti-Theft Doors, Smoke Doors