Hinge Properties: The package contains 20 pieces black hinges and 120 pieces screws. Hinge size: 44 x 31 mm. Mounting hole size: 4.2 mm. Screw size: 16 x 6 mm. Hinge Material: The hinges are made of 201 stainless steel with black surface coating. High strength, not easy to rust and resistant to erosion. Hinge Structure: The stainless steel hinge is made of 6 holes, the central axis is firmly connected, the gap is small and not easy to move. Both ends of the central shaft are riveted to ensure that the shaft is not easy to fall off. Easy Installation: The stainless steel piano plate comes with matching screws to meet your needs. They are easy to install and ready to use in minutes. Versatile: The hinged bar can be used for internal and external installations in private homes and businesses. Install small doors, windows, cabinets, toolboxes, wooden boxes, toolboxes, etc.