Feature:1. Durable, made of sturdy plastic, light in weight, and very durable in use.2. The capacity is large, the grid size is about 30x30mm, and it can hold 21 test tubes.3. Easy to store, the test tube rack has 3 separate parts, which need to be assembled and take up little space.4. Easy to disassemble and install, the threelayer design is convenient for the insertion and removal of the tube and is easy to carry.5. Easy to clean, using ABS material, can be cleaned with water, very convenient for your use.Specification:Item Type: Tube RackMaterial: ABSPurpose: Load test tubeGrid Size: Approx. 30x30mm / 1.2x1.2inNumber of holes: 21.Package List:3 x Test Tube Rack Board1 x Manual Note:1. Please allow 1‑2cm error due to manual measurement. Thanks for your understanding.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.