Detachable centrifuge tube rack size: WxLxH: 8.2x6.9x2.4 inches,Small Hole dia: 0.65 inches fits 15ml test tube, Big hole dia: 1.14'' fits 50 ml test tube. A way to help you count and store vials, 50 hole vial box to store 15ml and 50 ml centrifuge tubes. Please browse picture for better size reference, and make sure you purchase a right size box for your tubes.Package includes 1 box WITHOUT tubes.