Bel-Art F18749-0002 No-Wire Test Tube Grip Rack; 18-20mm, 40 Places, 9&sup3;/&#x2084; x 4&sup1;/&#x2088; x 2&sup3;/&#x2084; in., Polypropylene Test tubes 'hang in there' in any position, even inverted Retainer fingers hold tubes firmly in the rack plates with no fear of dislodging, making them perfect for both decanting and water bath work Rack made of a special blend of autoclavable polypropylene that is heavier than water for submerging into water baths Rack features end plates for labeling as well as numbered and lettered rows for tube identification; fold up sides lock firmly into the grip decks, so assembly takes only seconds Unloaded racks are stackable; steam autoclavable at 121 degree C (250 degree F)