Inferior hinges are mostly made of iron sheet and iron balls, which are not durable and easy to rust. They will easily fall off after a long time, causing the door to become loose or deformed. And when the rusted hinge is opened and closed, it will cause a harsh sound
In the market, many hinges are less than 3 mm thick, and generally have rough surfaces, uneven plating, impurities, and some have different lengths, deviations in hole positions and hole distances, and do not meet the decoration requirements.