One metal clip plate to accommodate up to 3 tubes with a diameter of 28-30mm. A maximum of 8 clip plates, 4 per side, may be attached to the magnetic platform (Part No. 0A-1100-030) for use with the Roto-Shake Genie, Enviro-Genie or Incubator-Genie. This attachment is included in the Roto-Shake Genie, Enviro-Genie.