There are various styles of file trays. There is a single layer. Multiple layers. Group and type. Wooden file tray: Generally, the board is formed by woodworking machinery and painted with gloss. After assembling small accessories. There is upright. There are 2 types of iron file trays on the side: Generally, the control is adopted to be formed by compression molding, and the paint is added in the test. It can be positioned by small screws. Upright is more. File trays have a wide range of uses, are simple to make, low cost, easy to use, and easy to promote.