12 Hole Test Tubes -- Designed with 12 sockets, which is about 57mm/2.2 inch wide, 179mm/7 inch long, 75mm/2.9 inch high, hole is 21mm/0.8 inch, can accommodate 12pcs 20ml 25ml test tubes, providing more capacity and convenience for experimental use Acrylic Material--The clear test tube is made of acrylic material, have good strength, durable and long service life, good light transmittance and high temperature resistance Two Layer Design -- The acrylic test tube bracket with a two layer design can better prevent the test tube from swinging left and right, firmly grip the test tube, and effectively avoid damage to the test tube Easy to Use --This test tube holder is very convenient in daily life or when doing experiments. You can put your test tube in the hole of the test tube holder, neat and orderly A Good Helper in Laboratory -- Very suitable for the laboratory, providing a clear view of the contents of the test tube and making it easy to insert and remove the test tube