S700-16 ChillBlock™ Profile Fit Microcentrifuge Tube Racks are available with either 15 & 30 wells holding 1.5 ml snap cap Microcentrifuge tubes. S700-14 is a 30-well rack and will hold 0.5 ml tubes. An alphanumeric grid allows for indexing rows and columns, therefore facilitating tube location. Each cavity will ensure a more efficient thermal exchange since it is in direct contact with the entire tube wall.