JA-18.1 Fixed-Angle Rotor, Aluminum; Includes 24 reversible adapters that provide 18,000 rpm maximum speed. Tubes are not included. In the J2-HC, maximum speeds are reduced to 15,000 rpm at 45 angle and 16,000 rpm at 25 angle. Major applications: High-force sedimentation in microcentrifuge tubes under refrigerated conditions. For use in Avanti J Series and J2 Series centrifuges (except Avanti J-E).