BioLink’s benchtop tube racks are made of 100% polypropylene and are available in three popular configurations. No. 18-1030 is a 4-way rack that can be used to hold 4x 50ml, 12x 15ml or 32x micro tubes (0.5, 1.5 or 2ml). They can be snap-linked together to form as large as rack as is needed. No. R1070 is a unique rack that holds 30x 15ml and 20x 50ml.