VWR Modular Heating Block for Microcentrifuge Tubes Solid anodized aluminum block. For use with Corning Microcentrifuge Tubes.Single block size. Dimensions:9.5Lx7.6Wx5.1Hcm(3-3/4 x 3 x 2in) For tube volume:2.0mL. Well Diameter 10.9mm. Number of wells:20.