MATERIAL AND DIMENSTIONS- the sample tube rack is made of solid plastic, sturdy and to use HOLDS 24 TEST TUBES - 24 holes, the width of the hole is 25mm, perfect for holding test tubes whose max diameter is 25mm or under DETACHABLE FEATURE- the plastic test tube rack comes 3 separated pieces, assemble required; can be stored put together or taken apart and laid flat, 't take up much more room SIMPLE TO ASSEMBLE - just fold the arms up, and insert the slotted holders and snap them together. It holds together WIDE APPLICATIONS - Work great for test tubes holding beads for jewelry making, holding gumballs/treats/candy/ for , holding liquids for lab experiment, perfect for home, school classroom, lab use Number of holes: 24 holes Aperture: 25mm Size: 245 * 104 * 70mm Material:plastic colour:white Package Contents: 2 * test tube racks Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.