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This easy-to-clean acrylic rack is made of 6mm thick transparent acrylic sheet. The size is 7.4"×3.0"×3.54", the layer height is 2.1", and it can hold up to 12 test tubes. Suitable for 13mm (0.5") to 17mm (0.7 ") Diameter test tube. Test tube not included. 2. With a grooved design at the bottom, it can stabilize inserts such as test tubes or pens, and you can also clearly see the contents of the test tube, and easily insert and remove the test tube. 3. You can give this acrylic test tube rack to your favorite chemistry graduate as a gift, or save it for your own storage and display. Whether you are actually using a chemical test tube, or prefer to use it as a glass, or even a spice container, API test tube, pen holder, razor holder, it is an ideal choice. Your glass tube is kept upright in this beautiful and transparent acrylic frame, clean, dry and not easy to break.