Package and Size--You will receive 3 test tube storage racks with 50 holes the size of the racks is 191mm long 98mm wide 26mm thick hole diameter: 12mm enough for your tube storage needs Easy to Use--This sample bottle rack is labeled with numbers on the horizontal side and letters on the vertical side which is convenient for you to record the differentiation of sample bottles during experimentation and make the experiment more accurate Space Saving--Our tube display racks keep your tubes organized and stackable for space-saving easy storage and are an essential tool for streamlining your work Polypropylene Material--This vial rack is made of polypropylene which is waterproof durable unbreakable lightweight and stable so you can use it with peace of mind Wide Application--Not only is it suitable for 12 mm diameter 2 ml HPLC autosampler vials but it can also be used for other similar sized test/incubation tubes such as 1.5 ml/1.8 ml/2 ml capacity freezing and centrifuge tubes