1.High Capacity: Holds up to 90 test tubes, ideal for large-scale experiments and sample organization. 2. Designed for 13mm Tubes: Perfect fit for standard 13mm diameter test tubes, offering a snug and secure hold. 3. Durable Material: Constructed from strong, chemical-resistant plastic for long-term use and easy cleaning. 4. Stable and Reliable: Features a wide, non-slip base to prevent tipping and ensure sample safety.