Feature: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 RackMaterial: 304 Stainless SteelApplication: Ideal for 50ml Test Tube, Applicable to Scientific Experiments, Plant Propagation and Storage of Cooking SpicesProduct 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 xMetal Test Tube Rack