NIUNIU Material: The hidden door hinge is made of high-quality stainless steel, which is corrosion-resistant, not rusted, and has strong load-bearing capacity. This ensures long service life and durability. 360 Degree Flip: For folding windows, doors and cabinets. Flexible and durable, with strong bearing capacity. Hollow hole design is not prominent, porous, fixed and does not move Dimensions: Installation hole spacing: 25mm. Overall dimensions: 100mm x 32mm. Mounting hole diameter: 5.2mm. Board thickness: 3mm (each board) Wide range of application: suitable for aluminum doors such as wooden doors, cabinet doors, toolboxes, etc. Easy installation: up and down functions, easy to install. Color: silver Quantity delivered: 2 pieces (without screws) Packaging: 2 hinges (only the above package contents, no other products)