Racks are essential tools for laboratory work and are used to hold and organize various laboratory items, such as test tubes, microcentrifuge tubes, and pipettes. These items can be made from a variety of materials, such as plastic or metal, and come in different shapes and sizes depending on the type of items they are designed to hold. Racks can be used for storage, transport, or even for experiments, and they often have special features to facilitate different uses. For example, some racks have lids to protect the contents during transport or to prevent contamination during experiments. Others may have a tilting mechanism that allows the user to easily remove and replace items. Racks are an essential tool for laboratory work, as they help to keep the workspace organized and can save time and effort by making it easier to locate and access the necessary items.