Securely holds multi-sized tubes in floor and benchtop shaking incubators. Process a wide range of sample sizes needed to move from one part of a procedure to the next. Each tube is angled on the rack to increase the sample's surface area. This gives more thorough mixing action without increasing rotational speed. Just one shaking incubator can be used for most of the sample growth process — reduced potential contamination of other processing machines and shorter cycle times expedite the procedures. Samples handled safely. No makeshift taping or clamping. Eliminates spills and breakage. Autoclavable. Holds tube sizes 1.5 and 2mL (18 holes); 5mL (12); 12mL (12); 50mL (6). Base mount is 6.25" diameter — fits floor and benchtop units. Made of wide gauge polypropylene.