Material: The hidden door hinge is made of high-quality stainless steel, which is corrosion-resistant, does not rust, and has strong load-bearing capacity. This ensures a long service life and durability. 360 DEGREE FLIP: Suitable for folding windows, doors, and cabinets. Flexible and durable with strong load-bearing capacity. The hollow hole design is flush, porous, fixed, and stable. Dimensions: Distance between mounting holes: 25mm. Total dimensions: 100mm x 32mm. Mounting hole diameter: 5.2mm. Plate thickness: 2mm (each plate). Wide Application: Suitable for wooden doors, cupboard doors, tool boxes, and aluminum doors. Easy Installation: Up and down function for easy installation. Contents: 2 hinges. Made of brushed stainless steel for long life. Suitable for front doors, windows, cabinets, tool boxes, etc. Smooth 360-degree rotation. Flexible and durable with strong load-bearing capacity. Hollow hole design is flush, porous, fixed, and stable. Contents: 2 sets of hidden hinges.