This smaller model of the UniRack can hold up to 25 polystyrene or polyprolylene 10 and 12 mm tubes, such as 10 x 75 mm or 12 x 75 mm sizes. This rack will accommodate all types of screw cap microtubes from 0.5 to 2 mLas well as 1 to 5 mL cryogenic vials. Flip the UniRack over and you can store up to 16 PCR or microcentrifuge tubes from 0.2 to 0.5 mL. Supplied without handles or anchor pins.