Detachable centrifuge tube rack size: WxLxH: 8.1x5.1x2.4 inches, Hole dia: WxLxH: 0.65 inches. A way to help you count and store vials, 50 hole vial box to store 15ml or 10ml 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.