The Z306-100-A20 by Hermle is a 10 x 1.5 ml/2.0 ml microtube insert for the Hermle Z306-100 4 x 145 ml swing-out rotor, 2/pk. Parent rotor: 4,500 rpm / 3,350 xg. Compatible with Hermle Z306 and Z326 centrifuges. Expands rotor to accept standard microtubes. Available from MBP Inc.