Bel-Art F18772-0001 Poxygrid Test Tube Rack; 20-25mm, 40 Places, 11/ x 5&sup1;/ x 3&sup1;/ in., Blue Unaffected by organic solvents, salts, weak acids and weak alkalis Square holes, three decks, a slotted grid bottom and reinforced edges Withstands a temperature range of -223C (-369F) to 121C (250F); can be autoclaved Overall measurements: 29.3 x 12.8 x 8.3cm (11-9/16 x 5-1/16 x 3-1/4") Blue; holds 40 tubes from 22 to 25mm