Product Name : Centrifuge Tube Rack Material : Plastic Fit for : 50ml Tubes; Hole Number : 21 Hole Size : 30 x 30mm / 0.12 inch x 0.12 inch (L*W) Overall Size : 25 x 11 x 7cm / 9.8 Inch x 4.3 inch x 2.7 Inch (L*W*H) Color: Blue Net Weight: 137g/pcs 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 * 21 holes for the centrifuge tube. Package Content: 10 x Centrifuge Tube Rack 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.