SODIAL Blue Plastic 21 Holes Box Rack Holder for 50ML Centrifuge Tubes 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)