Features: 1.PROFESSIONAL DESIGN: These tube racks are designed for 17mm/0.7inch test tubes or centrifuge tubes, suitable for laboratory or home use. 2.HOLD 18 TEST TUBES: Test tubes test tube racks can hold 18 test tubes in an orderly manner, thus saving a lot of space and serving as a carrier for better tube movement. 3.POLISHED SURFACES: Centrifuge tube rack has a highly polished surfaces with no edges or sharpness corners and is chemically resistant. 4.ACRYLIC MATERIAL: Test tube holder is made of acrylic material, clear, glossy, strong structure, strong impact resistance, light weight and durable. 5.VERSATILE: Not only for experiments, but also for kitchen storage of ground spices or spice mixtures.specification:Item Type: Acrylic Test Tube Rack Material: Acrylic Size: Approx. 15 x 7.6 x 7cm / 5.9 x 3.0 x 2.8in (Manual Measurement Error of 0.1 to 0.2cm) Use: Suitable for Laboratory or Home Use, Used to Store Test Tubes with Aperture Approx. 17mm / 0.7inPackageList:1 x AcrylicTestTubeRackNoteManual Measurement Error of 0.1 to 0.2cm