12/pack 4-place Tube Transit Units for 0.5ml-2.0ml ScrewCap and 0.5ml -2.0ml Snap Microcentrifuge Tubes, or 1.0ml - 2.0ml Internal and External Cryogenic Vials
Secure Snap-Shut Lid Each 4-place unit connects (snaps) together Made from clear, rigid HDPE.