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Z366-250-B50 by Hermle is a pack of 2 conical tube reducing inserts, each holding 4 × 50 ml conical tubes in the Z366-250-HC swing-out rotor on the Hermle Z366 benchtop centrifuge. Use them to run standard 50 ml conical tubes at the Z366's high-speed swing-out configuration for cell harvest, gradient separations, and supernatant clarification without a dedicated 50 ml rotor.