Features 1、Designed for 30mm Tubes: This test tube rack is designed with 6 holes in total, and each hole is about 30mm / 1.18in in diameter. 2、304 Stainless Steel: This centrifuge tube holder adopts premium 304 stainless steel material, and it's featured with sturdy structure and excellent impact resistance. 3、3 Tiers Design: This test tube holder is featured with 3 tiers design which ensures high stability, it can hold the tube firmly and avoid the test tube damage effectively, perfect for laboratory. 4、Multi Purpose: This centrifuge tube rack is widely applicable to scientific experiments, plant propagation and storage of cooking spices. 5、Easy to Use: This stainless steel tube rack is ideal for laboratory, which can provide clear view of the tube contents and convenient insertion and removal of tubes. Specification Item Type: Metal Test Tube Rack Material: 304 Stainless Steel Application: Ideal for 50ml Test Tube, Applicable to Scientific Experiments, Plant Propagation and Storage of Cooking Spices Product Size: Approx. 11.9 x 8.9 x 8.7cm / 4.7 x 3.5 x 3.4in ( Manual Measurement, Slight Error May Exist ) Package List 1 x Metal Test Tube Rack