Product Name : Centrifuge Tube Rack Material : Plastic Fit for : 50ml Tubes Hole Number : 21 Hole Size : 30 x 30mm or 0.12" x 0.12"(LxW) Overall Size : 25 x 11 x 7cm or 9.8" x 4.3" x 2.7"(LxWxH) Color : Blue Net Weight : 137g Package Content : 1 x Centrifuge Tube Rack Centrifuge Tube Box widely used to Storage Centrifuge Tube. Help to Organize your Centrifuge Tube. There are three Layers for the rack and it is 30MM x 21 holes for the centrifuge tube. Note:Light 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 1-3 cm. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.