Adapt-a-Rack™ is capable of holding different size tubes in each available slot! Each well individually adapts to your tube size and holds it in an upright position. The design enables you to hold 12 mm to 30 mm diameter (approx. 5 mL to 50 mL) tubes simultaneously and still allow full viewing of the tube label.Open sides allow for label viewingFlat base to hold tubes uprightSuitable for most round conical flat bottomed and even skirted tubesSingle rack measures 181 x 56 x 76 mmTwo racks includedAutoclavable