Descriptions:11mm/7.5mm hole diameter, 24 holes, double panel(well on both sides).Made of polypropylene, high temperature resistant, strong impact-resistance for long term use.Alphabet and number index for easily tracking the samples.Can withstand temperature range: -30℃(-22℉) to 140℃(284℉)Used for hold tubes in the laboratory, also can be used in the home, classroom, and other places.Specifications:Color: BlueMaterial: Polypropylene(PP)Hole Quantity: 24Hole Diameter:11mm / 0.43″, 7.5mm / 0.3″Fit for: 0.5ml/1.5ml/2ml TubeTotal Size: 110 x 60 x 23mm / 4.33″ x 2.36″ x 0.91″(L*W*H)Package Content: 1 x Tube Rack.