Installed in the chassis optical drive slot, used to place some small items that can be easily taken. The entire appearance and three-dimensional dimensions are the same size as a short optical drive. Installation is also as simple as installing an optical drive. It can be fastened with two screws (4 screws are provided randomly). It is especially suitable for storing some small items that you often use, and you can install multiple items to facilitate the classification and storage of items. The outer shell is made of iron to be fixed on the chassis optical drive slot. The movable part of the drawer inside the outer shell is made of plastic. Colour:black Material:Iron + Plastic Due to different batches, there may be differences in product appearance and printed text, which not affect use Package Contents: 1 * storage box Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.