Z326-85-A50R by Hermle/Benchmark Scientific is a 50 ml round tube insert for the 6×85 ml fixed-angle high-speed rotor (Z326-0685-25), sold 2 per pack. Enables 50 ml round-bottom tube runs on Z326, Z326-K, and Z366 centrifuges at up to 11,000 rpm / 13,932 ×g (Z326) or 13,500 rpm / 20,984 ×g (Z326-K).