The Z326-85-A15R by Hermle is a 2-pack of 10-15 ml round-bottom tube inserts for the Hermle Z326-0685 (6 x 85 ml) fixed-angle rotor on Z326/Z326K/Z32-HK/Z36-HK/Z366 centrifuges. Enables smaller-volume round-bottom tube runs in the 85 ml rotor without a rotor change.