The Z306-100-A57 by Hermle is a 7-position insert for 5 mL and 7 mL Vacutainer-type tubes, designed for the Z306-100 swing-out rotor on Hermle Z306 and Z326 centrifuges. The pack of two allows simultaneous loading of both rotor buckets for balanced sample runs in blood processing and serum separation workflows. Order at mbpinc.net/quickorder using SKU Z306-100-A57.