Z496-1000-A57 by Hermle is a 46 × 5–7 mL tube insert for the Hermle Z496-1000-RBUK deep rectangular centrifuge bucket (2 inserts per pack). It enables the Hermle Z496K ultra high-volume floor centrifuge to process small-format 5–7 mL tubes inside the standard 1000 mL deep rectangular buckets — up to 46 tubes per bucket position — without requiring a rotor change.