This pack of four polypropylene racks includes one each of blue, green, yellow and red. Rotate racks to hold tubes and vials of various sizes. Each rack can hold: * 4 centrifuge tubes with 50ml capacity; or * 12 centrifuge tubes with 15ml capacity; or * 32 microcentrifuge tubes with 1.5–2.0ml capacity; or * 32 microcentrifuge tubes with 0.5ml capacity; or * 32 RIA vials or plastic test tubes with 12mm outer diameter and 75mm tall Each rack measures 175mm long x 90 mm wide x 65mm tall. Built to withstand temperatures from -80° to 121°C. Autoclavable.