These clear acrylic racks allow for convenient storage of test tubes and provide sufficient space between tubes to let you read the individual tube labels. Racks can be used in refrigerator or freezer, are stackable for compact storage and have handles for easy carrying. Three different racks accommodate 13, 16 or 20mm tubes. Racks are 5½ in. high with stacking option that accommodates tubes up to 125mm long. Colored bases are available on special orders.