Attractive, crystal-clear, acrylic test tube holders are an effective way to display the difference in the amount of sugar, fat, or fiber in various foods. Because they are clear from top to bottom, you can compare even the smallest amount of sugar, fat, or fiber. Holes are 5/8 in. diameter. Overall dimensions: 6-1/2 in. L x 2-1/2 in. H x 2-3/4 in. D.