Each well has fingers that flex that adapt to accommodate a variety of tubes sizes while holding them in a firm upright position * Made of POM * Racks can be linked together for additional capacity * Open sides allow for label viewing * Flat base to hold tubes upright * Available in solid or a combination of colors for easy coding identification SPECIFICATIONS: * Autoclavable: True * Color: Blue * Dimensions (L x W x H): 7.1 x 2.2 x 3 in (18.1 x 5.6 x 7.6 cm) * Material: POM * No. of Wells: 4 * Quantity: Pack of 2 * Tubes: 7-50 mL * Well Diameter: 12-30 mm