ITEM NAME:Blue Plastic 21 Holes Box Rack Holder for 50ML Centrifuge Tubes F2S5 Blue Plastic 21 Holes Box Rack Holder for 50ML Centrifuge Tubes F2S5 Product Name : Centrifuge Tube Rack Material : Plastic Fit for : 50ml Tubes; Hole Number : 21 Hole Size : 30 x 30mm / 0.12" x 0.12"(L*W) Overall Size : 25 x 11 x 7cm / 9.8" x 4.3" x 2.7"(L*W*H) 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 * 21 holes for the centrifuge tube. Note:Light shooting 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.