Made from material, it is built to withstand daily use in busy laboratory environments. Each hole has a scale for easy positioning of samples, making it quick and efficient to retrieve or place vials when Instruction: Insert the vials into the compartments of the vial holder. When you need to access a specific vial, simply locate it within the rack and gently lift it out. Application: This test tube rack provides a convenient and organized solution for storing and organizing autosampler vials, helping to streamline your laboratory work . Suitable for HPLC, , LC/MS applications, high-throughput analysis sample preparation, lab research, and more. This tube holder offers versatility in accommodating different lab needs. Advantage: With its stackable feature, it allows you to maximize your storage space by vertically stacking multiple racks on top of each other. Note: that the tube rack is completely dry before reusing or stacking.