Modular polypropylene workstation holds most commonly used laboratory tubes, PCR tubes, and PCR plates. Connect the individual components together with a simple twist to create an expandable rack with whatever configuration or length you require. One pack contains four blocks. Each component will hold two 50 ml (30 mm diam.), eight 15 ml (18 mm diam.), twelve 1.5 or 2.0 ml (11 mm diam.), six 0.5 ml (8 mm diam.), 48 0.2 ml PCR, or six 8-tube PCR tubes. Two components connected together will hold one 96-well PCR plate or eight 12-tube PCR tubes.