Description Workstation rack holds 4 different sizes of microtubes, screwcap microtubes, PCR tubes and microcentrifuge tubes. The back row features a locking system that holds tubes securely for one-handed opening and closing. Multiple racks can be interlocked. Available in red, green and blue. Polypropylene Autoclavable at 121°C for 20 minutes   Back row features locking system that holds tubes securely for one-handed opening and closing Multiple racks can be interlocked Material: Polypropylene Autoclavable at 121°C for 20 min. Lowest level is for 0.2mL tubes Middle level is for 0.5mL tubes Top level is for 1.5mL and 2.0mL tubes Back of the top level has 5 holes for one-handed cap turning of screwcap microcentrifuge tubes