Features: 1.Designed for 19mm Tubes: This test tube rack is designed with 12 holes in total, and each hole is about 19mm / 0.75in in diameter. 2.304 Stainless Steel: This centrifuge tube holder is made of premium 304 stainless steel material, and it's featured with sturdy structure and excellent impact resistance. 3.3 Tiers: This test tube holder features 3 tiers design which can hold the tube firmly and avoid the test tube damage effectively, perfect for laboratory. 4.Wide Application: 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: Convenient Insertion and Removal of Tubes in Laboratory Product Size: Approx. 15.9 x 8.5 x 6.2cm / 6.3 x 3.3 x 2.4in ( Manual Measurement, Slight Error May Exist ) PackageList:1 x Metal Test Tube Rack