The Z327-200-A25 by Benchmark Scientific (Hermle) is a 25ml conical-bottom tube insert for the Z327-200-BUK swing-out bucket, compatible with Z307 and Z327 universal centrifuges. Each insert holds 4 × 25ml tubes; the rotor runs at 5,000 rpm / 4,136 xg. Sold as a 2-pack.